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Delayed sleep phase is a sleep disorder that affects the internal clock, known as circadian rhythm. People with this sleep disorder have sleep patterns that are delayed two hours or more from usual sleep patterns. They go to sleep later and wake later. This makes it hard to wake in time for work or school. Delayed sleep phase also is known as delayed sleep-wake phase disorder.
A treatment plan might include making changes to sleep habits, taking melatonin supplements and using light therapy....
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People with delayed sleep phase fall asleep and wake later than they want and later than usual sleep and wake times. Sleep and wake times are delayed at least two hours and may be delayed up to 3 to 6 hours. People with delayed sleep phase may regularly go to sleep at 3 a.m. and wake at 10 a.m., for example.
Symptoms are persistent. They last at least three months and often for years. Symptoms may include:
Delayed sleep phase is caused by a person's internal clock being out of sync with the environment. Your internal clock lets you know when it's time to sleep and when it's time to wake. Known as circadian rhythm, your internal clock is on a 24-hour cycle. Cues in the environment influence the sleep-wake cycle. These cues include light, darkness, eating and physical activity.
The exact cause of delayed sleep phase isn't known. But circadian rhythms can be delayed in teenagers for biological re...
A health care professional works with you to create a treatment plan that can help adjust your sleep and wake times.
Your plan may include:
Improving sleep habits. Making lifestyle changes can improve your sleep habits. This is known as sleep hygiene. To practice good sleep hygiene, go to bed and wake on a regular schedule, including on the weekends. It's best not to take naps during the day. Don't drink caffeine or alcohol near bedtime. And don't use tobacco products....
For informational purposes only and not a substitute for professional medical advice, diagnosis, or treatment.
© Mayo Clinic
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