Sleep is a vital component of physical and mental well-being. However, many individuals experience difficulties with sleep that go beyond occasional restlessness or tiredness. Sleep disorders are a group of conditions that disrupt the quality, timing or duration of sleep, leading to daytime fatigue, reduced concentration and impaired overall functioning. These conditions can affect adults and children alike and may arise from a variety of underlying causes, including medical, neurological, behavioural or lifestyle factors.
Insomnia is one of the most frequently encountered sleep disorders. It is characterised by difficulty falling asleep, staying asleep, or waking too early and not being able to return to sleep. Persistent insomnia can significantly impact daytime alertness and quality of life.
Sleep-related breathing disorders include conditions such as obstructive sleep apnoea (OSA), where repeated partial or complete blockage of the airway disrupts breathing during sleep. This can lead to loud snoring, gasping or choking sensations and excessive daytime sleepiness.
These disorders occur when there is a misalignment between an individual’s internal body clock and the external environment. Examples include delayed sleep phase and non-24-hour sleep–wake disorder, which may cause difficulty falling asleep at typical times or maintaining a consistent sleep schedule.
Parasomnias are characterised by unusual behaviours during sleep or at the transition between sleep and wakefulness. Common examples include sleepwalking, sleep talking and nightmare disorders. These events may be distressing.
Conditions such as restless legs syndrome (RLS) and periodic limb movement disorder (PLMD) involve involuntary movements during rest or sleep, which can disrupt sleep continuity and reduce sleep quality.
Hypersomnias are characterised by excessive daytime sleepiness despite adequate or prolonged night-time sleep. Individuals with hypersomnia may experience persistent fatigue, difficulty maintaining alertness and impaired functioning during daily activities.
There are several potential causes of hypersomnia, including medical, neurological and sleep-related conditions. Narcolepsy is one such cause and is a chronic neurological disorder that affects the brain’s ability to regulate sleep and wakefulness. Other causes of hypersomnia may include insufficient sleep, certain medications, mood disorders and other underlying sleep disorders.
Accurate diagnosis of sleep disorders typically begins with a detailed clinical history. Healthcare professionals may ask about sleep patterns, daytime symptoms and relevant health conditions. In many cases, sleep studies such as polysomnography, actigraphy and multiple sleep latency test are used to identify underlying disturbances.
Treatment varies depending on the type of sleep disorder and its causes. Approaches may include:
Treatment plans are individualised, and in many cases multidisciplinary care involving sleep specialists, physicians and allied health professionals offers the best outcomes.
Sleep disorders are common yet often under-recognised conditions that can significantly affect physical health, mental wellbeing and everyday functioning. Importantly, sleep disorders frequently coexist or overlap, with more than one condition contributing to an individual’s symptoms. For this reason, a comprehensive medical assessment is essential to ensure an accurate diagnosis and to identify all relevant contributing factors.
Early assessment, careful evaluation and personalised treatment can lead to meaningful improvements in sleep quality and overall quality of life.
A sleep disorder is a condition that affects the quality, timing or duration of sleep. Unlike occasional poor sleep, sleep disorders are persistent and can lead to daytime fatigue, poor concentration and reduced daily functioning. They can affect both adults and children and may have medical, neurological, behavioural or lifestyle causes.
Common sleep disorders include insomnia, sleep-related breathing disorders such as obstructive sleep apnoea, circadian rhythm sleep-wake disorders, parasomnias (for example sleepwalking or nightmares), movement-related sleep disorders like restless legs syndrome, and hypersomnias, which involve excessive daytime sleepiness.
Symptoms vary depending on the condition but may include difficulty falling or staying asleep, waking too early, loud snoring or breathing pauses during sleep, unusual behaviours at night, involuntary limb movements, persistent daytime sleepiness, fatigue and difficulty maintaining alertness during daily activities.
Diagnosis usually begins with a detailed clinical assessment of sleep patterns, daytime symptoms and medical history. Depending on the suspected condition, investigations such as polysomnography, actigraphy or a multiple sleep latency test may be used to identify underlying sleep disturbances.
Treatment depends on the specific sleep disorder and its underlying causes. Options may include sleep hygiene and behavioural strategies, cognitive behavioural therapy for insomnia (CBT-I), devices such as CPAP for sleep apnoea, and medications or supplements where appropriate. Treatment plans are individualised and often involve multidisciplinary care to achieve the best outcomes.
