Medicines for Excessive daytime sleepiness

What it is

Excessive daytime sleepiness is when a person feels very sleepy during the day, struggles to stay awake, or falls asleep at inappropriate times, in a way that goes beyond ordinary tiredness and affects their daily life. It is a common problem, and it is a symptom rather than a diagnosis in itself, with many possible causes — so identifying the underlying cause is key. Common causes and contributors include: not getting enough sleep (insufficient sleep, which is very common, for example due to lifestyle, work patterns, or habits); poor-quality or disrupted sleep (for example from a sleep disorder such as obstructive sleep apnoea, where breathing is repeatedly interrupted during sleep, causing daytime sleepiness; or from insomnia, restless legs, or other sleep problems); shift work or an irregular sleep schedule; certain medical or mental health conditions (such as depression, an underactive thyroid, or other conditions); certain medicines; alcohol or substance use; and, less commonly, specific sleep disorders that cause excessive sleepiness (such as narcolepsy). The impact of excessive daytime sleepiness can be significant — it can affect concentration, memory, mood, performance at work or school, relationships, and quality of life, and it can be dangerous in certain situations (such as driving or operating machinery while sleepy). Because there are many possible causes, and because many of them are treatable, it is worth identifying the cause: sometimes it is a matter of improving sleep habits and getting enough sleep, while in other cases treating an underlying sleep disorder (such as sleep apnoea) or another condition makes a big difference. It is worth seeing a GP if excessive daytime sleepiness is persistent, unexplained, or affecting your life, so the cause can be assessed and addressed — and it is important not to ignore it, particularly given the safety implications (for example, not driving if you are too sleepy, and following the rules on sleepiness and driving). The key messages are that excessive daytime sleepiness has many causes (often insufficient or poor-quality sleep, or a sleep disorder such as sleep apnoea), that it can significantly affect life and safety, and that it is worth investigating, as many causes are treatable.

How it is treated

Excessive daytime sleepiness is managed by identifying and treating the underlying cause, and because there are many possible causes — many of them treatable — assessment is worthwhile. A useful first step is to consider and address the most common cause: not getting enough good-quality sleep. Improving sleep habits and ensuring enough sleep can resolve sleepiness for many people — this includes keeping a regular sleep schedule, allowing enough time for sleep, good sleep hygiene (such as a comfortable, dark, quiet bedroom, avoiding screens, caffeine, and alcohol before bed, and a wind-down routine), and addressing lifestyle or work patterns affecting sleep where possible. If sleepiness persists despite adequate, good-quality sleep, or if there are features suggesting a sleep disorder or other cause, seeing a GP for assessment is important. The GP can look for underlying causes — for example, asking about sleep patterns and symptoms, and considering conditions such as obstructive sleep apnoea (suggested by loud snoring, pauses in breathing during sleep observed by others, and waking unrefreshed, along with daytime sleepiness), insomnia, restless legs, depression, thyroid problems, or the effects of medicines — and may arrange tests (such as blood tests) or refer to a sleep service for assessment (including sleep studies) where a sleep disorder is suspected. Treatment then depends on the cause: for example, treating obstructive sleep apnoea (often very effectively, for example with a device that keeps the airway open at night, which can transform daytime sleepiness), treating insomnia or restless legs, managing depression or thyroid problems, reviewing medicines, or, for specific disorders such as narcolepsy, specialist treatment. Addressing the cause often makes a big difference. Safety is an important consideration: excessive sleepiness can be dangerous, particularly when driving or operating machinery, so it is important not to drive if you are too sleepy, to be aware of the rules and responsibilities regarding sleepiness (and certain sleep disorders) and driving, and to address the sleepiness. The reassuring messages are that excessive daytime sleepiness usually has an identifiable and often treatable cause, that improving sleep resolves it for many people, and that assessing and treating any underlying cause (such as sleep apnoea or another condition) can make a big difference — so it is worth investigating rather than putting up with it.