Circadian rhythm disorders are a group of sleep disorders where one’s
endogenous circadian clock for sleep does not align with one’s environmental sleep
wake schedule. The misalignment leads to complaints of poor sleep and wake time
consequences such as excessive sleepiness, poor concentration, and even mood
symptoms. Treatments vary depending on the disorder, but consist of re-entraining the
circadian sleep clock using bright light and melatonin as well as developing sleep
promoting behaviors.
Keywords: Advanced sleep phase disorder, Circadian clock, Circadian rhythm disorders, Delayed sleep phase disorder, Dim light melatonin onset, Irregular sleep-wake disorder, Jet lag disorder, Minimum body temperature, Non-24 hour disorder, Shift work disorder
