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

Stephen Soreff, MD


October 20, 2016

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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