Advanced Sleep Phase Disorder (ASPD)

Advanced sleep phase disorder is a circadian rhythm condition where a person's internal body clock is shifted earlier than typical, causing them to feel very sleepy in the early evening and wake up unusually early in the morning.

It results from a genetically influenced shift in the body's internal circadian clock, becoming more common with increasing age, and can occasionally run in families with a clear inherited pattern.

Symptoms include an inability to stay awake in the early evening, often falling asleep around 7 to 9pm, and waking naturally very early, typically between 2 and 5am, despite adequate sleep duration.

It is not dangerous in itself, but it can cause social and occupational difficulties if it conflicts significantly with usual daily schedules, work commitments, or family and social activities.

Yes, a genetic form has been identified in some families, following an autosomal dominant inheritance pattern, though many cases occur without a clearly identifiable genetic cause, particularly age-related cases.

Yes, treatment options include timed bright light therapy in the evening and, in some cases, melatonin timed appropriately, aimed at gradually shifting the sleep schedule later.

Treatment typically involves evening bright light exposure to delay the body clock, combined with good sleep hygiene practices, and sometimes carefully timed melatonin under specialist guidance.

Gradual improvement is often seen over several weeks of consistent light therapy and sleep schedule adjustment, though some degree of early sleep tendency may persist, particularly in older adults.

Many people naturally prefer earlier sleep and wake times without significant life disruption, while advanced sleep phase disorder specifically causes distressing or impairing early sleep onset and early waking that conflicts with desired or required schedules.

See a doctor if early sleep timing is significantly disrupting your life. NHS sleep clinic referral can take many weeks, while private sleep specialist assessment is often available within about two weeks.