What Is Delayed Phase Sleep Syndrome?
Delayed phase sleep syndrome is a sleep disorder that delays a person’s sleep-wake cycle by two or more hours. People with this disorder have trouble falling asleep and waking up, even if they use sleep aids such as sleeping pills. For most people, the sleeping trouble begins at adolescence; when the problem is of adult onset, it often is associated with depression. Delayed phase sleep syndrome is also called delayed sleep phase syndrome or DSPS.