Fast Five Quiz: How Much Do You Know About Sleep Disorders?

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.