Delayed Sleep Phase Syndrome (DSPS)

Delayed Sleep Phase Syndrome (DSPS) is a chronic disorder of sleep timing. DSPS sufferers tend to fall asleep very late and have difficulty waking up in the morning.

Often, DSPS individuals can’t sleep until early morning, no matter what time they go to bed. Unless they have another sleep disorder, such as sleep apnea, DSPS patients can sleep well and have a normal need for sleep.

They often find it very difficult to wake up in time for a typical school or work day if they’ve only slept for a few hours. However, they sleep soundly, wake up spontaneously, and do not feel sleepy again until their next "night" if they’re allowed to follow their own late schedule such as sleeping from 4 a.m. to noon.

The syndrome usually develops in late childhood or adolescence, and sometimes disappears in adolescence or early adulthood.

Additional information on the diagnosis and treatment of Delayed Sleep Phase Syndrome is available for download in pdf format.