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睡眠相後退症候群
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Wikipedia definition
1. Delayed sleep phase disorder​Delayed sleep-phase disorder (DSPD), also known as delayed sleep-phase syndrome (DSPS) or delayed sleep-phase type (DSPT), is a circadian rhythm sleep disorder, a chronic disorder of the timing of sleep, peak period of alertness, the core body temperature rhythm, hormonal and other daily rhythms, compared to the general population and relative to societal requirements. People with DSPD generally fall asleep some hours after midnight and have difficulty waking up in the morning.
Read “Delayed sleep phase disorder” on English Wikipedia
Read “睡眠相後退症候群” on Japanese Wikipedia
Read “Delayed sleep phase disorder” on DBpedia

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