Circadian Rhythm Disorders (CRD)

Symptoms include excessive sleepiness and lack of daytime alertness. In the circadian rhythm disorder called delayed sleep phase syndrome, patients tend to fall asleep at very late times and have difficulty waking up in time for school. In another disorder, advanced sleep phase syndrome, the major sleep episode is advanced in relation to the desired clock time. The result is evening sleepiness, an early sleep onset and waking up earlier than desired.

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