Sleep Services

Sleep disorders remain one of the most underdiagnosed areas of medicine. They are frequently managed with short-term solutions that address the symptom rather than the cause. At Central Health London, with our sleep specialist, Consultant Neurologist Dr Oliver Bernath, we take a more thorough approach, treating sleep as the central health function it is, and asking why it has broken down before deciding how to treat it.

Understanding Sleep Disorders

Sleep disorders are not a single condition. They are a diverse group of presentations, each with different causes, mechanisms and treatment pathways. What they share is the capacity to significantly disrupt health, and the tendency to be missed or mismanaged when assessed in isolation.

Sleep disturbance sits at the intersection of neurology, psychiatry and medicine. It can be the primary problem, or it can be a symptom of something else entirely; an anxiety disorder, a thyroid condition, early neurodegeneration, or a hormonal shift. In many cases it is both: a condition in its own right that has been made worse by an underlying driver that hasn't yet been identified.

This is why specialist assessment matters. A thorough sleep evaluation goes beyond sleep hygiene advice. It looks at the full clinical picture, sleep architecture, daytime functioning, physical health, mental health, medication, lifestyle, and builds a coherent understanding of what is actually happening.

Sleep Conditions We See

Insomnia 

Insomnia is the most common sleep disorder, affecting roughly one in three adults at some point. It is characterised by persistent difficulty falling asleep, staying asleep, or waking too early, with daytime consequences including fatigue, poor concentration, irritability and low mood.

Chronic insomnia, defined as occurring at least three nights per week for three months or more, is rarely just a habit problem. It is frequently maintained by psychological factors, particularly hyperarousal and conditioned wakefulness, and is often intertwined with anxiety or depression. Effective treatment requires addressing both the sleep pattern and the underlying drivers. Where psychological support is needed alongside sleep treatment, this is available within the same clinic.

Obstructive Sleep Apnoea

Obstructive sleep apnoea (OSA) occurs when the upper airway repeatedly collapses during sleep, causing breathing to pause and sleep to fragment. Many people with OSA are unaware they have it.  The condition is often identified through a partner's observations, or through unexplained fatigue, poor concentration and morning headaches rather than obvious breathing symptoms.

Untreated OSA carries significant health risks, including increased likelihood of hypertension, cardiovascular disease, type 2 diabetes and stroke. It is also strongly associated with cognitive impairment and low mood. Upper airway resistance syndrome represents a milder but clinically significant variant, in which airway narrowing disrupts sleep quality without causing complete apnoeas.

Circadian Rhythm Disorders 

The body's internal clock, the circadian rhythm, governs the timing of sleep, hormone release, body temperature and metabolism across a 24-hour cycle. When this rhythm is misaligned with external time, the result is difficulty sleeping at conventional hours, persistent fatigue and impaired daytime function.

Delayed sleep phase disorder, in which the sleep window shifts significantly later than conventional norms, is particularly common in younger adults and is frequently mistaken for insomnia or poor discipline. Other circadian disruptions arise from shift work, frequent long-haul travel, and neurological or psychiatric conditions that affect the brain's timekeeping mechanisms.

Parasomnias

Parasomnias are abnormal behaviours or experiences that occur during sleep or the transitions between sleep and wakefulness. They range from relatively benign presentations such as sleepwalking, sleep talking, confusional arousals to more clinically significant conditions.

REM sleep behaviour disorder, in which the normal muscle paralysis of REM sleep is absent and individuals physically act out their dreams, warrants particular attention. It is associated with an increased risk of neurodegenerative conditions including Parkinson's disease and Lewy body dementia, and early identification can be clinically important.

Nightmare disorder, characterised by frequent distressing dreams that disrupt sleep and cause significant daytime impact, is often associated with anxiety, trauma and PTSD, and responds well to targeted psychological and pharmacological treatment. Our psychiatry and psychology and counselling teams work alongside Dr Bernath where trauma or mental health factors are a significant driver.

Restless Legs Syndrome and Periodic Limb Movements

Restless legs syndrome (RLS) produces uncomfortable sensations in the legs, typically described as crawling, pulling or aching, that are worse at rest and relieved by movement. Symptoms are most pronounced in the evening and at night, making sleep onset difficult and significantly affecting quality of life.

RLS is frequently linked to iron deficiency, even in the absence of anaemia, as well as to renal disease, peripheral neuropathy and certain medications. Periodic limb movement disorder, in which repetitive leg movements occur during sleep, often coexists with RLS and further fragments sleep architecture. Where an underlying medical condition is suspected, our general practice team can provide coordinated investigation and management.

Narcolepsy and Hypersomnia

Narcolepsy is a neurological condition affecting the brain's ability to regulate sleep-wake states, resulting in excessive daytime sleepiness, sudden episodes of muscle weakness triggered by emotion (cataplexy), sleep paralysis and vivid hallucinations at sleep onset or waking. It is significantly underdiagnosed, often for a decade or more before the correct diagnosis is made.

Idiopathic hypersomnia presents similarly in terms of excessive daytime sleepiness, but without the specific features of narcolepsy. Both conditions carry substantial impact on daily functioning, employment and quality of life, and require specialist investigation and management.

Understanding the Cause of Sleep Disorders

One of the most important questions in sleep medicine is whether the sleep disorder is primary, a condition in its own right, or secondary, driven by something else that has not yet been fully addressed.

Common underlying drivers of sleep disturbance include anxiety, depression and PTSD; thyroid dysfunction, diabetes and other metabolic conditions; neurological disorders including early neurodegenerative disease; chronic pain; hormonal changes associated with menopause, the postnatal period or other endocrine shifts; and the effects of medication.

In practice, the distinction between primary and secondary is often not clear-cut. Insomnia that began during a period of acute stress may persist long after the stressor has resolved, maintained by psychological and behavioural factors that have taken on a life of their own. Sleep apnoea may worsen anxiety. Circadian disruption may deepen depression. These interactions are the rule, not the exception, and addressing them requires a clinical approach that holds the full picture.

At Central Health, this means drawing on psychiatry, psychology and general practice within the same coordinated team, rather than referring patients sequentially across disconnected services.

How Sleep Treament Works

Assessment and treatment follow a staged model, personalised to each patient.

1. Stabilisation: In acute or severe cases, restoring sleep is the immediate priority. Prolonged sleep deprivation has significant physiological and psychological consequences, and addressing it early reduces distress and creates the conditions for more thorough investigation.
   

2. Diagnosis: Identifying the underlying drivers through detailed clinical assessment, sleep diary review, blood tests, and where indicated, formal sleep studies including polysomnography — an overnight investigation that measures brain activity, breathing, oxygen levels, heart rate and limb movements during sleep.
   

3. Targeted treatment: Addressing root causes directly, whether through management of an underlying medical or psychiatric condition, optimisation of relevant medications, or structured behavioural and environmental intervention.
   

4. Gold-standard insomnia treatment: Where primary insomnia is the diagnosis, Cognitive Behavioural Therapy for Insomnia (CBT-I) is the most evidence-based treatment available, with strong and durable outcomes in clinical trials. It addresses the psychological and behavioural factors that perpetuate insomnia, and is recommended as first-line treatment ahead of medication by NICE and international sleep societies. Carefully selected pharmacological support is available where appropriate.

Sleep and Neurology

Sleep medicine at Central Health sits within a broader neurological service. Dr Bernath sees patients across the full range of neurological conditions, including migraine and headache disorders, epilepsy and episodes of loss of consciousness, Parkinson's disease and movement disorders, dementia and cognitive decline, multiple sclerosis, and peripheral neuropathy and chronic pain syndromes.

The overlap between neurology and sleep is significant. Many neurological conditions disrupt sleep architecture; equally, poor sleep can accelerate cognitive decline, lower seizure threshold and worsen neuropathic pain. Identifying and treating sleep disorders in the context of a neurological condition is not an optional extra, it is part of managing the condition well.

Sleep in Specific Circumstances

Sleep needs and sleep disorders present differently depending on life stage and circumstance. Dr Bernath provides specialist guidance for:

• Pregnancy and the postnatal period: Sleep architecture changes significantly during pregnancy, and postnatal sleep disruption extends well beyond the demands of a newborn. Identifying and treating sleep disorders in this context requires careful consideration of the clinical picture and any implications for mother and baby. Where obstetric or perinatal mental health input is also needed, our obstetrics and psychiatry teams are available within the same clinic.

• Menopause: Hormonal changes during perimenopause and menopause frequently disrupt sleep, through night sweats, mood changes and shifts in circadian rhythm. Sleep assessment in this context forms part of a broader conversation about hormonal and mental health.

• High-performance lifestyles: For professionals, executives and athletes operating under sustained pressure, optimising sleep is not simply about avoiding tiredness. It affects cognitive performance, decision-making, emotional regulation and physical recovery. Sleep assessment in this context is both clinical and performance-oriented.

• Frequent travel across time zones: Chronic circadian disruption from regular long-haul travel has measurable health consequences over time. Structured guidance on circadian management can significantly reduce its impact.

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