Dr Nijjer — Sleep & the Heart Preview

Cardiovascular Health

Sleep & the Heart —
A Cardiologist's Guide

Sleep is not passive rest — it is the period during which the cardiovascular system repairs, recovers, and resets. Dr Nijjer explains how poor sleep damages the heart, how much you truly need, and how obstructive sleep apnoea — the most common and most treatable sleep disorder — is diagnosed and treated.

12 minute read

Restful sleep for heart health — Dr Nijjer Harley Street cardiologist

Key Takeaways — Read This First

What You Need to Know About Sleep & Your Heart

Adults need 7–9 hours of sleep per night — consistently sleeping fewer than 6 hours raises the risk of coronary heart disease by 48% and doubles the risk of dying from a cardiac event
During deep sleep, blood pressure falls by 10–20% — this "nocturnal dip" is essential for cardiovascular recovery. People who do not dip have two to three times the cardiovascular event rate of normal dippers
Obstructive sleep apnoea (OSA) — repeated partial or complete airway collapse during sleep — affects at least 1 in 4 adults, the majority of whom are undiagnosed; it is a leading cause of resistant hypertension, atrial fibrillation, and coronary artery disease
OSA is highly treatable: CPAP therapy normalises blood pressure, reduces AF burden, lowers cardiovascular event rates, and dramatically improves quality of life and daytime functioning
Cognitive Behavioural Therapy for Insomnia (CBT-I) is more effective than sleeping tablets for chronic insomnia and carries no long-term risks — it is the recommended first-line treatment
Sleep quality matters as much as quantity — fragmented sleep, poor deep-sleep proportion, and untreated OSA all impair cardiovascular recovery even if total hours appear adequate

The Foundation of Cardiovascular Recovery

How Much Sleep
Does the Heart Need?

The National Sleep Foundation, the European Society of Cardiology, and the American Heart Association all recommend seven to nine hours of sleep per night for adults. This is not a lifestyle preference — it is a biological requirement. The cardiovascular system uses sleep not as a passive rest period but as an active maintenance window during which blood pressure falls, inflammation resolves, and the arterial endothelium repairs itself.

Sleeping consistently fewer than six hours is associated with a 48% higher risk of developing or dying from coronary heart disease compared to those sleeping seven to eight hours — a finding from a meta-analysis of 475,000 participants across fifteen studies. Importantly, the relationship is U-shaped: sleeping more than nine hours consistently is also associated with elevated cardiovascular risk, though this most likely reflects underlying illness or depression causing excessive sleep rather than long sleep itself being harmful.

Quality matters as much as quantity. A person sleeping eight hours with untreated obstructive sleep apnoea may be deprived of deep restorative slow-wave sleep and oxygen-saturated sleep throughout. The brain and heart register this as insufficient sleep regardless of the total hours in bed. Feeling unrefreshed after a full night's sleep, waking with a headache, or needing a nap despite adequate overnight sleep are all signals that sleep quality — not just duration — requires assessment.

Approximately one third of UK adults report regularly sleeping fewer than seven hours — meaning tens of millions of people are carrying an elevated but largely silent cardiovascular risk that is principally driven by insufficient sleep.

The "sleep debt" myth: You cannot fully repay accumulated sleep deprivation by sleeping in at weekends. While weekend recovery sleep partially restores glucose metabolism and mood, studies show that cardiovascular inflammatory markers and blood pressure responses remain impaired even after recovery sleep — the damage from the working week is not entirely undone. Consistency of sleep schedule, not occasional long lie-ins, is what the heart needs.

The Evidence in Numbers

48% higher risk of developing or dying from coronary heart disease with consistently fewer than 6 hours of sleep Cappuccio et al. — European Heart Journal 2011 — 475,000 participants across 15 studies

1 in 4 adults has obstructive sleep apnoea — with the majority undiagnosed and therefore untreated, carrying silent cardiovascular risk Heinzer et al. — Lancet Respiratory Medicine 2015; ESC 2023 consensus estimate

58% of patients with resistant hypertension — blood pressure uncontrolled on three or more drugs — have underlying obstructive sleep apnoea Logan et al. — Journal of Hypertension 2001; confirmed across multiple subsequent cohorts

Understanding What Happens at Night

The Four Stages of Sleep — Why Each One Matters

Sleep is not a uniform state. The brain cycles through four distinct stages roughly every 90 minutes, each serving a different physiological purpose. A full night's sleep completes four to six of these cycles. Disrupting specific stages — as obstructive sleep apnoea does — has direct consequences for cardiovascular health.

Stage 1 N1 — Light Sleep Transition into sleep ~5% of total sleep time

The transition between wakefulness and sleep. Muscle tone decreases and hypnic jerks — the sudden twitching sensation of falling — may occur. Brain waves slow from alpha to theta rhythm. This stage is easily disrupted; noise, light, and anxiety all fragment it.

Blood pressure begins to fall. Heart rate and breathing slow slightly. Body temperature drops. The parasympathetic nervous system begins to take over from the sympathetic.

CV significance: Entry point for recovery. Repeated awakenings (from OSA, noise, pain) return the patient to N1 and prevent deeper, restorative sleep.

Stage 2 N2 — Core Sleep Light-to-moderate depth ~45% of total sleep time — the largest proportion

The most time is spent here. Characterised by sleep spindles (bursts of neural activity) and K-complexes. Body temperature and heart rate continue to fall. The brain actively suppresses awareness of the external environment to maintain sleep.

Blood pressure falls further — typically 5–10% below waking levels. Growth hormone release begins. This is the stage most disrupted by caffeine, alcohol, and stress hormones lingering from the day.

CV significance: Where most of the nocturnal blood pressure dip occurs. Insufficient N2 disrupts the dip and sustains overnight sympathetic activity.

Stage 3 N3 — Deep Sleep Slow-wave sleep — the most restorative stage ~20% of total sleep time — reduced with age and OSA

Deep slow-wave sleep is where the most profound cardiovascular restoration occurs. Blood pressure reaches its lowest point of the 24-hour cycle — typically 10–20% below waking levels in healthy individuals. Growth hormone is secreted almost exclusively during this stage. Inflammatory cytokines are cleared. The endothelium repairs micro-damage from the preceding day.

People woken from N3 feel profoundly groggy — "sleep inertia" — as the brain is most deeply offline. OSA attacks most commonly fragment N3 sleep, depriving patients of its restorative effects even when total sleep time appears normal.

CV significance: The nocturnal blood pressure dip is generated here. Non-dippers — those who fail to achieve this — have 2–3× higher cardiovascular event rates. OSA is the leading cause of non-dipping.

Stage 4 REM — Dream Sleep Rapid Eye Movement — emotionally and cognitively vital ~25% of total sleep time — increases in later cycles

During REM, the brain is almost as active as wakefulness, but the body is paralysed. This is the stage of vivid dreaming, emotional memory consolidation, and creativity. Heart rate and blood pressure fluctuate significantly — more so than in non-REM sleep — as the cardiovascular system responds to dream content.

REM is paradoxically the stage with the highest cardiovascular risk: most sudden cardiac deaths and heart attacks occur in the early morning hours when REM sleep predominates. The surge in sympathetic activity, combined with increased blood pressure variability and platelet aggregability, makes the REM-rich early morning the most vulnerable window for patients with pre-existing coronary disease.

CV significance: Greatest cardiovascular variability and vulnerability. Most MIs occur 6am–noon. REM disruption by OSA adds to this vulnerability and impairs emotional regulation — worsening anxiety and stress reactivity.

The Biological Pathways

How Poor Sleep
Damages Arteries & the Heart

Sleep deprivation is not simply tiredness — it is a systemic physiological stressor with direct, measurable consequences for every major cardiovascular risk factor. The mechanisms are multiple, overlapping, and cumulative over time.

Blood pressure: Insufficient sleep prevents the nocturnal blood pressure dip — the 10–20% overnight fall that allows the arterial walls to recover from the haemodynamic stresses of the day. When this dip is absent or blunted (the "non-dipper" pattern, diagnosed on ambulatory blood pressure monitoring), the heart and blood vessels are under continuous pressure load with no recovery window. Non-dippers have two to three times the rate of cardiovascular events compared to normal dippers — a risk attributable in large part to undiagnosed OSA.

Cortisol and the stress response: Cortisol reaches its lowest point naturally between midnight and 4am during adequate sleep. Sleep deprivation prevents this trough, leaving cortisol elevated throughout the following day, driving chronic low-grade inflammation, insulin resistance, and abdominal fat deposition — all established accelerators of atherosclerosis. After just one night of insufficient sleep, measurable elevations in inflammatory markers including CRP and IL-6 are detectable in the bloodstream.

The hunger hormones and obesity: Sleep deprivation disrupts the balance between leptin (the satiety hormone) and ghrelin (the hunger hormone) — reducing leptin and raising ghrelin, creating a biological drive to eat more the following day. Chronically sleep-deprived individuals consume on average 385 additional calories per day compared to well-rested controls. This is a major pathway through which poor sleep promotes weight gain, metabolic syndrome, and ultimately cardiovascular disease.

Endothelial function: A single night of restricted sleep impairs the endothelium's ability to dilate in response to increased blood flow — a function known as flow-mediated dilation (FMD), which is one of the earliest detectable markers of arterial disease. Over years, this cumulative endothelial impairment accelerates the development of atherosclerotic plaques.

Platelet aggregation: Sleep deprivation increases platelet stickiness and clotting tendency, making the blood more likely to form a clot on a vulnerable plaque. This is compounded in the early morning REM-dominant hours when sympathetic activation peaks — explaining why the 6–10am window carries the highest risk of heart attack and sudden cardiac death.

Condition-Specific Links

Sleep & Specific
Heart Conditions

Poor sleep and OSA have particularly strong relationships with several common cardiac conditions. In many cases, treating sleep problems produces clinically meaningful improvements in the cardiac condition itself.

Sleep & High Blood Pressure

OSA is the most common reversible cause of secondary hypertension — meaning blood pressure that is high because of an identifiable underlying condition rather than essential hypertension. In patients with blood pressure that is poorly controlled despite two or three medications, OSA should always be considered and formally excluded before additional drugs are prescribed.

The mechanism is direct: each apnoea episode causes a surge in sympathetic nervous system activity and a sharp spike in blood pressure. In moderate-to-severe OSA, these spikes may occur thirty or more times per hour throughout the night, sustaining the blood vessel walls under continuous haemodynamic stress. CPAP therapy reduces blood pressure by an average of 3–5 mmHg — modest but clinically significant, particularly in resistant cases.

High Blood Pressure guide

Sleep & Atrial Fibrillation

The relationship between OSA and atrial fibrillation is one of the most compelling in sleep cardiology. OSA is present in 30–50% of patients with AF — a rate far above that seen in the general population. The mechanisms are multiple: repeated oxygen desaturations during apnoeas stress the atrial muscle; the sympathetic surges following each apnoea create an arrhythmogenic environment; and the negative intrathoracic pressures generated during airway obstruction mechanically stretch the atrial walls.

Critically, treating OSA improves AF outcomes. Patients who use CPAP consistently have significantly lower rates of AF recurrence after cardioversion and ablation procedures compared to those with untreated OSA. For any AF patient who snores, is overweight, or reports excessive daytime sleepiness, OSA screening should be a routine part of their cardiac management.

Atrial Fibrillation guide

Sleep & Heart Failure

Sleep-disordered breathing is extremely common in heart failure, affecting 50–75% of patients. Two distinct patterns exist. Obstructive sleep apnoea — the same upper airway collapse seen in the general population, made worse by fluid redistribution and pharyngeal oedema. Central sleep apnoea with Cheyne-Stokes respiration — a pattern driven by the failing heart itself, in which breathing waxes and wanes in a crescendo-decrescendo cycle, reflecting the heart's inability to maintain stable respiratory drive through adequate cardiac output.

Both patterns worsen cardiac function through nocturnal hypoxia and sympathetic overdrive, and both contribute to exercise intolerance, fluid retention, and hospitalisation. Optimising heart failure medications, treating OSA with CPAP where indicated, and elevating the head of the bed are standard components of integrated heart failure management.

Heart Failure guide

Sleep & Coronary Artery Disease

Short sleep duration and OSA both independently accelerate coronary atherosclerosis. Imaging studies using coronary CT calcium scoring show that sleep-deprived individuals have significantly higher coronary artery calcium scores — a direct measure of atherosclerotic plaque burden — even after adjusting for conventional risk factors. The inflammatory and endothelial mechanisms described above appear to be the dominant pathways.

In patients who have already had a heart attack, sleep quality is a strong determinant of recovery and long-term outcome. Depression following a heart attack — itself closely linked to sleep disturbance — doubles the risk of a further event within one year. Sleep assessment and management should be a routine component of post-MI care and cardiac rehabilitation, not an afterthought.

Coronary Heart Disease guide

The Most Important Sleep Disorder in Cardiology

Obstructive Sleep Apnoea —
What Is It?

Obstructive sleep apnoea is a condition in which the muscles of the upper airway relax during sleep and the throat collapses partially or completely, repeatedly blocking breathing. Each episode — an "apnoea" — causes oxygen levels to fall, the brain to briefly rouse from sleep to restore airway tone, and the cardiovascular system to fire a surge of adrenaline to compensate. In significant OSA, this cycle may repeat dozens or hundreds of times every hour throughout the night.

Most patients with OSA are entirely unaware that their sleep is being shattered in this way. Their partner may describe loud snoring interrupted by silence and then a gasping or choking sound. The patient themselves may feel that they slept a full night but wake feeling unrefreshed, with a dull headache, and struggle to stay awake during the day. Over time, the cumulative cardiovascular burden of thousands of adrenaline surges per night, night after night, becomes enormous.

Who is at risk? The classic profile is a middle-aged man who is overweight with a large neck circumference — but this description misses a significant proportion of cases. Women develop OSA at higher rates after the menopause (when oestrogen's protective effect on pharyngeal tone diminishes). Thin individuals with specific craniofacial anatomy — a small jaw, a recessed chin, or enlarged tonsils — can have severe OSA regardless of weight. Around 30% of patients referred to sleep clinics are of normal BMI. Suspicion should be based on symptoms and screening questionnaires, not body shape alone.

Symptoms that should prompt investigation: loud snoring, witnessed pauses in breathing during sleep, waking with a dry mouth or headache, unrefreshing sleep despite adequate hours, excessive daytime sleepiness (falling asleep while watching TV, reading, or as a passenger in a car), nocturia (waking to pass water more than once per night), and difficulty concentrating or mood changes during the day. If two or more of these apply, speak to your GP or cardiologist about a sleep study.

Screening & Formal Testing

How OSA Is Diagnosed

Diagnosis involves a screening questionnaire to assess risk followed by a formal sleep study to measure the frequency and severity of apnoeas. Both steps are important: the questionnaire identifies who needs testing, and the sleep study confirms the diagnosis and guides treatment.

The Validated Screening Tool

The STOP-BANG Questionnaire

Answer Yes or No to each question — one point for every Yes

S

SnoringDo you snore loudly — louder than talking or loud enough to be heard through a closed door?
T

TiredDo you often feel tired, fatigued, or sleepy during the daytime — even after a full night's sleep?
O

ObservedHas anyone observed you stop breathing during your sleep, or have you woken gasping or choking?
P

PressureDo you have, or are you being treated for, high blood pressure?
B

BMIIs your body mass index greater than 35?
A

AgeAre you older than 50 years?
N

NeckIs your neck circumference greater than 40 cm (approximately 15.7 inches)?
G

GenderAre you male?

Interpreting Your Score

0–2 Yes

Low Risk of OSA OSA is unlikely but not excluded if symptoms are prominent. Reassure and advise on sleep hygiene. Re-assess if symptoms develop or cardiovascular conditions emerge.

3–4 Yes

Intermediate Risk Moderate probability of OSA. A home sleep apnoea test (HSAT) should be arranged. Patients with cardiovascular disease or resistant hypertension should be investigated even at this score.

5–8 Yes

High Risk — Investigation Recommended High probability of moderate-to-severe OSA. Formal sleep study should be arranged urgently, particularly in patients with established cardiovascular disease. A score of 5 or above predicts moderate-severe OSA in the majority of patients.

Important: The STOP-BANG questionnaire is a screening tool, not a diagnostic test. A formal sleep study — either a home apnoea test or in-lab polysomnography — is required for diagnosis. Speak to your GP or cardiologist if you score 3 or above, or if you have any of the symptoms listed above regardless of your score.

From Suspicion to Solution

Sleep Studies & Treatment Options

Once OSA is suspected, a sleep study formally measures the severity using the Apnoea-Hypopnoea Index (AHI) — the number of breathing events per hour. This score determines the appropriate treatment pathway. Effective treatment is available for all grades of severity.

How OSA Is Formally Diagnosed

Sleep Studies

From home monitoring to in-laboratory polysomnography

The Apnoea-Hypopnoea Index (AHI) measures how many times per hour breathing is completely stopped (apnoea) or significantly reduced (hypopnoea) during sleep. It is the primary measure of OSA severity.

5–14 Mild events per hour

15–30 Moderate events per hour

>30 Severe events per hour

Home Sleep Apnoea Test (HSAT / Level 3): A portable device worn overnight at home measuring airflow, oxygen saturation, breathing effort, and heart rate. Convenient and accessible — the standard first-line investigation for most patients. Arranged by GP or cardiologist and returned by post.
In-Laboratory Polysomnography (PSG / Level 1): The gold standard. Full overnight recording in a sleep unit with EEG (brain waves), EOG (eye movements), EMG (muscle tone), ECG, airflow, effort belts, oximetry, and video. Required when home testing is inconclusive, central sleep apnoea is suspected, or complex sleep disorders are present.
WatchPAT device: A wrist-worn home test that uses peripheral arterial tone and actigraphy to estimate sleep stages and AHI. More accurate than basic pulse oximetry alone; increasingly used in cardiology settings for convenience.
Epworth Sleepiness Scale: An eight-item questionnaire measuring daytime sleepiness in common situations. A score above 10 indicates significant daytime somnolence warranting investigation. Often used alongside STOP-BANG for comprehensive screening.
Ambulatory blood pressure monitoring: Identifies non-dipping pattern on overnight blood pressure trace — a useful indirect indicator that OSA may be contributing to blood pressure control problems even before formal sleep testing.

Treatment Options by Severity

Treating OSA

From lifestyle change to devices to surgery — matched to severity and patient preference

CPAP Gold-standard treatment for moderate-severe OSA — reduces AHI by >90% in compliant users

CPAP (Continuous Positive Airway Pressure): A mask worn during sleep connected to a machine that delivers gentle continuous air pressure, splinting the airway open and preventing collapse entirely. Effective in virtually all patients with moderate-severe OSA. Modern machines are quiet, compact, and automatically adjust pressure. NHS prescribes and follows up CPAP for diagnosed patients. Usually transformative within the first week — patients often describe dramatic improvements in energy, mood, and blood pressure.
Mandibular Advancement Device (MAD): A custom-fitted dental splint worn during sleep that advances the lower jaw and tongue, enlarging the pharyngeal airspace. As effective as CPAP in mild-to-moderate OSA and better tolerated by many patients. Fitted by a dentist or oral maxillofacial specialist. An excellent alternative for CPAP-intolerant patients or those with primarily positional OSA.
Weight loss: A 10% reduction in body weight reduces AHI by approximately 26% in overweight patients. The most sustained and impactful lifestyle intervention. Weight loss medicines (Wegovy, Mounjaro) have shown impressive reductions in OSA severity in recent trials — SURMOUNT-OSA demonstrated >60% reduction in AHI with tirzepatide alongside lifestyle modification.
Positional therapy: In patients whose OSA occurs predominantly when sleeping on their back (supine-dependent OSA — approximately 30% of cases), devices worn around the torso or neck encourage side-sleeping. Simple, non-invasive, and effective in this subgroup.
Hypoglossal nerve stimulation (Inspire device): An implantable pacemaker-like device that stimulates the hypoglossal nerve to contract the tongue during sleep, preventing collapse. STAR trial showed 68% reduction in AHI. Licensed for CPAP-intolerant patients with moderate-severe OSA. Implanted as a day-case procedure by a specialist ENT surgeon.
Surgery: Tonsillectomy (in patients with large tonsils), uvulopalatopharyngoplasty (UPPP), or maxillomandibular advancement are reserved for selected patients in whom anatomy is the dominant cause. Surgical outcomes are variable and should be assessed by a specialist sleep surgeon after full evaluation.

Evidence-Based Behavioural Strategies

Ten Sleep Habits That Actually Work

Sleep hygiene is the collection of habits and conditions that support consistently good sleep. These recommendations are grounded in chronobiology and sleep science — not folk wisdom. Implementing three or four consistently produces measurable improvements in sleep quality within two to four weeks.

Fix Your Wake Time — Not Your Bedtime

The single most powerful sleep hygiene intervention is a consistent wake time, seven days a week, including weekends. This anchors your circadian rhythm. Varying wake time by more than 90 minutes across the week fragments the sleep-wake cycle and significantly worsens sleep quality. Once your wake time is fixed, a consistent bedtime follows naturally as sleep pressure builds.

Keep the Bedroom Cool, Dark, and Quiet

Core body temperature must fall by 1–2°C to initiate and maintain sleep. The optimal bedroom temperature for sleep is 16–19°C — most people sleep in rooms that are too warm. Complete darkness is critical: even small amounts of light through eyelids suppress melatonin. Blackout blinds or a sleep mask make a significant difference. For noise, white noise machines or earplugs are evidence-backed sleep aids.

No Screens for 60–90 Minutes Before Bed

Blue-wavelength light from phones, tablets, and laptops suppresses melatonin secretion from the pineal gland — delaying sleep onset and reducing total slow-wave sleep. The content of screens matters too: email, social media, and news activate the prefrontal cortex and elevate cortisol at precisely the moment they should both be falling. Enable Night Shift / night mode from 8pm and charge your phone outside the bedroom.

No Caffeine After 1–2pm

Caffeine has a half-life of five to seven hours — meaning half of a 3pm coffee is still circulating at 10pm. It works by blocking adenosine receptors; adenosine is the "sleep pressure" molecule that accumulates during wakefulness and drives the urge to sleep. Caffeine masks this pressure without eliminating it, leading to poor deep-sleep and early-morning fatigue. Cutting off caffeine at 1–2pm is the most effective single dietary change for sleep quality.

Alcohol Is a Sleep Disruptor — Not an Aid

Alcohol's sedative effect is real but deceptive. It suppresses REM sleep in the first half of the night, rebounds into fragmented, REM-dominant sleep in the second half, and reduces total slow-wave (deep) sleep. Net effect: sleep feels heavier but is less restorative. Regular evening alcohol use disrupts the nocturnal blood pressure dip and worsens OSA by relaxing pharyngeal musculature further. The evidence consistently shows that alcohol worsens sleep quality even at moderate doses.

Exercise — But Time It Correctly

Regular aerobic exercise is one of the most evidence-backed interventions for sleep quality: it increases slow-wave sleep and reduces the time to fall asleep. However, vigorous exercise within two to three hours of bedtime raises core body temperature and cortisol, delaying sleep onset. Morning or early afternoon exercise produces the strongest sleep benefits. Even a 20-minute walk significantly improves sleep quality compared to a sedentary day.

Get Bright Light in the Morning

Morning light exposure — ideally sunlight within 30–60 minutes of waking — triggers a cortisol awakening response that anchors the circadian rhythm and sets the timing of evening melatonin release precisely 14–16 hours later. This is the biological mechanism behind why outdoor morning exercise is particularly effective for sleep. On dark winter mornings, a 10,000 lux SAD lamp for 20–30 minutes achieves the same effect.

Do Not Lie in Bed Awake

If you are awake in bed for more than 20 minutes, get up. Go to a dim, quiet room and do something calm — reading a physical book, gentle stretching, or breathing exercises — until you feel sleepy, then return to bed. This preserves the association between bed and sleep (known as stimulus control), which is eroded every time you lie awake in bed anxious or frustrated. This counterintuitive instruction is the cornerstone of CBT-I for insomnia.

Limit Naps to 20 Minutes Before 3pm

A 20-minute nap in the early afternoon restores alertness and performance without impairing night sleep. Longer naps enter slow-wave sleep and produce grogginess on waking (sleep inertia); naps after 3pm reduce the adenosine sleep pressure that drives the transition to sleep at bedtime. For patients with insomnia, napping should generally be avoided entirely during the treatment period — every hour of daytime sleep is borrowed directly from the night.

Develop a Wind-Down Routine

The transition from the arousal of the day to the relaxation required for sleep takes time — usually 45–60 minutes. A consistent pre-sleep routine signals to the brain that sleep is approaching, gradually reducing cortisol and raising melatonin. Effective wind-down activities include a warm bath or shower (the subsequent skin cooling lowers core temperature and promotes sleepiness), light reading, gentle yoga or stretching, and the breathing technique described on our stress management page.

When Sleep Hygiene Is Not Enough

Treating Insomnia — CBT-I vs Sleeping Tablets

Insomnia — defined as difficulty falling or staying asleep at least three nights a week for more than three months, causing daytime impairment — affects approximately 10–15% of adults chronically. The treatment options differ dramatically in their evidence base and long-term effects.

CBT-I — Cognitive Behavioural Therapy for Insomnia

The evidence-based first-line treatment — more effective than medication

CBT-I is a structured, typically six-to-eight-week programme that addresses the thoughts, behaviours, and conditioned arousal patterns that sustain chronic insomnia. It is recommended as the first-line treatment for chronic insomnia by NICE, the American College of Physicians, and the European Sleep Research Society — ahead of any medication.

A landmark meta-analysis of 20 randomised controlled trials found that CBT-I produced larger and more durable improvements in sleep onset latency, wake time after sleep onset, and sleep quality than any pharmacological treatment — and, critically, the benefits persist long after the programme ends, whereas medication effects end when the pills stop.

Sleep restriction therapy — paradoxically, limiting time in bed rebuilds deep sleep pressure
Stimulus control — re-associating bed with sleep only, not wakefulness or anxiety
Cognitive restructuring — addressing catastrophising thoughts about sleep
Relaxation techniques — progressive muscle relaxation, controlled breathing
Sleep hygiene education — the evidence-based habits above
Access: NHS Talking Therapies (self-refer), Sleepio app (validated digital CBT-I), private therapist

Sleeping Tablets — Honest Information

Short-term relief with important limitations for cardiac patients

Sleeping tablets — including benzodiazepines (temazepam, diazepam) and Z-drugs (zopiclone, zolpidem) — reduce sleep onset time and increase total sleep duration. They are appropriate for short-term use (two to four weeks maximum) in acute situational insomnia — such as bereavement or a medical crisis. They are not appropriate for long-term management of chronic insomnia.

Cardiovascular considerations are important: benzodiazepines and Z-drugs suppress slow-wave sleep and REM sleep, paradoxically worsening sleep quality despite sedation. They carry significant risks of dependence, cognitive impairment, falls in older adults, and rebound insomnia on discontinuation. They also worsen OSA by relaxing pharyngeal musculature.

Appropriate only for short-term use — two to four weeks maximum
Suppress slow-wave sleep — reduces the restorative value of sleep despite sedation
Worsen OSA — contraindicated in confirmed or suspected sleep apnoea
Significant dependence risk with regular use beyond four weeks
Low-dose sedating antihistamines (e.g., promethazine) carry less dependence risk but similarly suppress sleep quality
Melatonin — evidence supports its use for circadian rhythm disorders and jet lag; modest benefit in insomnia, particularly in adults over 55

Sleep Is a Cardiac Investigation

Dr Nijjer assesses sleep quality and OSA risk as part of a comprehensive cardiovascular evaluation — including ambulatory blood pressure monitoring to detect non-dipping patterns, and referral for formal sleep studies where indicated. Appointments available at Harley Street and across London, often within the same week.

Book a Consultation View All Conditions

Call 0203 983 8001 · jessica@oneheartclinic.com

Medical disclaimer: This page provides general patient education and does not constitute personal medical advice. If you suspect you may have obstructive sleep apnoea, speak to your GP or cardiologist — do not attempt self-diagnosis or self-treatment. Information on this page is based on published clinical evidence as at May 2026. Individual assessment and treatment planning requires a qualified clinician.