Non-24-hour sleep–wake disorder

（重定向自Hypernychthemeral syndrome）

A sleep diary with nighttime in the middle and the weekend in the middle, to better notice trends

Non-24-hour sleep–wake disorder (non-24), is one of several chronic circadian rhythm sleep disorders (CRSDs). It is defined as a "chronic steady pattern comprising [...] daily delays in sleep onset and wake times in an individual living in society." Symptoms result when the non-entrained (free-running) endogenous circadian rhythm drifts out of alignment with the light/dark cycle in nature.

单词	Hypernychthemeral syndrome
释义	Hypernychthemeral syndrome 英语百科 Non-24-hour sleep–wake disorder （重定向自Hypernychthemeral syndrome） Non-24-hour sleep–wake disorder (non-24), is one of several chronic circadian rhythm sleep disorders (CRSDs). It is defined as a "chronic steady pattern comprising [...] daily delays in sleep onset and wake times in an individual living in society." Symptoms result when the non-entrained (free-running) endogenous circadian rhythm drifts out of alignment with the light/dark cycle in nature.
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