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People who suffer from Delayed Sleep Phase Syndrome are generally unable to reset their circadian rhythm by moving their bedtime and rising time earlier. In chronotherapy an attempt is made to move bedtime and rising time later and later each day, around the clock, until these times reach the number of hours of sleep per night an individual needs to be fully functional. According to Michael B Russo, MD, the number of hours of sleep per night necessary for an individual to be fully functional is still unknown because the function of sleep has yet to be fully determined. Some people claim full effectiveness with only 3-5 hours of sleep per night, while others admit to needing 8 (or more) hours of sleep per night to perform effectively.While Chronotherapy has been successful for some, it is necessary to rigidly maintain the desired sleep/wake cycle thenceforth. Any deviation in schedule tends to allow the body clock to shift later again.Here's an example of how Chronotherapy could work over a week's course of treatment, with the patient going to sleep three hours later every day until the desired sleep and waketime is reached. This technique assumes that an individual can perform effectively with 8 hours of sleep per night. Shifting the sleep phase by 3 hours per day may not always be possible. Shorter increments of 1-2 hours are needed in such cases.Example:
Reverse chronotherapy Sometimes, although extremely infrequently, "reverse" chronotherapy - i.e., gradual movements of bedtime and rising time earlier each day - has been used in treatment of patients with abnormally short circadian rhythms, in an attempt to move their bedtimes to later times of the day. Because circadian rhythms substantially shorter than 24 hours are extremely rare, this type of chronotherapy has remained largely experimental, with very little large-scale study.
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