
DSPS is characterized by:
Persistent inability (>6 months) to fall asleep and awaken at socially accepted times
Ability to maintain sleep once sleep is achieved
Normal total sleep times
Peak alertness in late evening and night
Typically seen in adolescents, young adults, and night workers
ASPS occurs much less frequently than DSPS and has the following features:
Persistent, early-evening sleep onset (between 6:00 PM and 9:00 PM)
Early-morning wake-up time (generally between 3:00 AM and 5:00 AM)
Peak alertness in early morning
Usually stable sleep schedule
Normal total sleep time
Most frequently occurs in elderly patients and in depressed individuals
For more on circadian rhythm disorder, read here.
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Any views expressed above are the author's own and do not necessarily reflect the views of WebMD or Medscape.
Cite this: Stephen Soreff. Fast Five Quiz: How Much Do You Know About Sleep Disorders? - Medscape - Oct 20, 2016.
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