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Delayed sleep-wake phase disorder

Delayed sleep-wake phase disorder
Actigram from a patient with delayed sleep-wake phase disorder (DSWPD). A 24-hour time interval (ranging from 6 PM to 6 PM) is depicted on the X axis; sequential dates are depicted on the Y axis. The actigram registers signal intensity (motion), and the contrast in signal activity serves to distinguish between wakefulness versus pronounced inactivity and/or sleepiness.
In this example, the individual appears to habitually fall asleep at approximately 4 AM nightly (arrow). During periods of unrestricted sleep, the estimated rise time occurs at 12 PM or later (arrowhead). There may be competing exogenous contributors with respect to the perpetuated delayed sleep-wake phase, as there are periods of pronounced inactivity apart from the consolidated sleep period, suggestive of napping (horizontal bars).
Graphic 106126 Version 2.0