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Sleep deprivation does not reset the circadian clock of DSPD patients, as it does with normal people. [26] People with the disorder who try to live on a normal schedule cannot fall asleep at a "reasonable" hour and have extreme difficulty waking because their biological clocks are not in phase with that schedule.
If patients set their own schedule for sleep and wake, aligned to their endogenous non-24 period (as is the case for most sighted patients with this disorder), symptoms of insomnia and wake-time sleepiness are much reduced. However, such a schedule is incompatible with most occupations and social relationships. [citation needed]
In addition to normal ways of moving into a new sleep stage, there are a whole slew of reasons why someone could wake up during the night. ... (which disrupts the sleep cycle), having an irregular ...
A circadian rhythm is an entrainable, endogenous, biological activity that has a period of roughly twenty-four hours. This internal time-keeping mechanism is centralized in the suprachiasmatic nucleus (SCN) of humans, and allows for the internal physiological mechanisms underlying sleep and alertness to become synchronized to external environmental cues, like the light-dark cycle. [4]
The current formally correct name of the disorder is Irregular Sleep Wake Rhythm Disorder. [11] This disorder has been referred to by many other terms, including: Irregular Sleep Wake Pattern, [12] irregular sleep wake syndrome, [8] Irregular Sleep Wake Cycle or Irregular Sleep Wake Schedule, [13] and Irregular Sleep Wake Disorder (ISWD). [7]
Schematic illustration of a normal sleep cycle. The standard figure given for the average length of the sleep cycle in an adult man is 90 minutes. N1 (NREM stage 1) is when the person is drowsy or awake to falling asleep. Brain waves and muscle activity start to decrease at this stage. N2 is when the person experiences a light sleep.
Here is an example of how chronotherapy could work over a week's course of treatment, with the patient going to sleep 3 hours later every day until the desired sleep and wake time is reached. [1] Day 1: sleep 3:00 am to 11:00 am; Day 2: sleep 6:00 am to 2:00 pm; Day 3: sleep 9:00 am to 5:00 pm; Day 4: sleep 12:00 pm to 8:00 pm; Day 5: sleep 3: ...
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