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Advanced Sleep Phase Syndrome
What Is Advanced Sleep Phase Syndrome?
Advanced sleep phase syndrome is a disorder in which the timing of sleep and the peak period of alertness are advanced several hours relative to societal clock. People with advanced sleep phase syndrome generally have difficulty staying awake unless they go to bed very early because their internal clock is already at a relatively quiet state, and wake up very early, at what is considered a "normal" time in the morning, unable to fall back asleep, because their internal clock is already producing strong alerting signals.
Unless other sleep disorders, such a sleep apnea or insomnia, are present, an individual with advanced sleep phase syndrome sleeps well (in terms of duration and quality) when going to bed and waking up early but the syndrome makes it difficult to stay awake in the evening and be engaged in social activities. Sleep quality is not impaired by the syndrome but afflicted individuals may have short sleep duration if they delay their bedtime. Nonetheless people with advanced sleep phase syndrome do not report that the syndrome affects their daytime work or school activities. Their most common complaint is that their evening activities are cut short by the need to sleep much earlier than what is considered the norm. This can affect family and social relationships. Individuals with Advanced Sleep Phase Syndrome should be cautious about driving in the late afternoon and evening, because they may be too drowsy. They also do not adjust well to evening or night shifts.
The prevalence of advanced sleep phase syndrome in the general population is unknown although it is most prevalent among older adults. Advanced sleep phase syndrome has the same prevalence among men and women. Researchers have also found a strong genetic link: 40%-50% of people suffering from advanced sleep phase syndrome are related to someone who has the syndrome.
Learn more about circadian sleep disorders.
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Advanced Sleep Phase Syndrome
Advanced phase sleep syndrome (ASPD) is a disruption of the circadian rhythm, causing the afflicted to go to sleep earlier than normal & wake up earlier than normal.
Advanced Sleep Phase Syndrome
ASPD