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Written by the OrganizedWisdom Team with as the reviewer. All original content is supervised by the The OrganizedWisdom Medical Review Team
sleepdisorderchannel.com
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Delayed sleep phase syndrome (DSPS), sometimes called phase lag syndrome, is a sleep disorder of circadian rhythm. A person with this disorder is typically unable to fall asleep before 2 a.m. and has great difficulty waking early, say by 7 a.m. In one recent study, DSPS accounted for 40 percent of disorders involving sleep-wake schedules among 5,000 participants.
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