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Delayed sleep phase disorder (DSPD), more often known as delayed sleep phase syndrome and also as delayed sleep–wake phase disorder, is the delaying of a person's circadian rhythm (biological clock) compared to those of societal norms.
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: ...
The related and more common delayed sleep phase disorder was not described until 1981. The first detailed study of non-24 in a blind subject was by Miles Le and his colleagues in 1977. The researchers reported on a 28-year-old male who had a 24.9-hour rhythm in sleep, plasma cortisol, and other parameters.
Circadian rhythm sleep disorders (CRSD), also known as circadian rhythm sleep–wake disorders (CRSWD), are a family of sleep disorders that affect the timing of sleep. CRSDs cause a persistent pattern of sleep/wake disturbances that arise either by dysfunction in one's biological clock system, or by misalignment between one's endogenous oscillator and externally imposed cues.
Familial natural short sleep (FNSS) is a distinct category of habitual short sleep. Individuals with this trait usually get 4–6.5 hours of sleep per day but do not have daytime sleepiness and do not need catch-up sleep on the weekends. After sleep deprivation, these individuals have less of a sleep deficit than individuals without FNSS.
Delayed sleep phase disorder or syndrome; Dementia; Dermatillomania; Dermatomyositis; Developmental coordination disorder; Diabetic neuropathy; Disc herniation; Diffuse sclerosis; Diplopia; Disorders of consciousness; Distal hereditary motor neuropathy type V; Distal spinal muscular atrophy type 1; Distal spinal muscular atrophy type 2 ...
The behavior displayed by the peacock in the above video is not random. He is employing a series of peacock courtship moves that demonstrate his energy and muscular power and therefore his value ...
Starting about two hours before an individual's regular bedtime, exposure of the eyes to light will delay the circadian phase, causing later wake-up time and later sleep onset. The delaying effect gets stronger as evening progresses; it is also dependent on the wavelength and illuminance ("brightness") of the light.