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Choose one answer

1. AIrregular sleep-wake rhythm disorder, with fragmented sleep across the day
2. BShift work disorder, caused by working hours conflicting with the natural clock
3. CNon-24-hour sleep-wake disorder, a progressively shifting daily sleep pattern
4. DAdvanced sleep phase disorder, a shift of the sleep-wake cycle to an earlier time
5. EDelayed sleep phase disorder, a shift of the sleep-wake cycle to a later time