Other names: DSWPD

Delayed sleep-wake phase disorder (DSWPD) is a common circadian rhythm sleep-wake disorder characterized by difficulty initiating sleep at a socially acceptable bedtime at night and consequent difficulty waking at a desirable time in the morning.

DSWPD is caused by the body's internal circadian rhythms failing to synchronize with the environmental light-dark cycle.

People with DSWPD may describe themselves as "night owls," but cannot conform to a sleep schedule compatible with conventional social obligations.

DSWPD typically presents in the teenage years and can persist into adulthood. It is thought that DSWPD may be a reaction to the normal shift in circadian rhythms seen in many adolescents after puberty.

Treatment for DSWPD includes:

• encouraging good sleep hygiene.
• shifting the bedtime schedule.
• bright light therapy.
• medications such as melatonin.

Drugs used to treat Delayed Sleep-Wake Phase Disorder