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5 Facts you should know about

Non 24 syndrome



Non 24 hour sleep-wake disorder refers to a steady pattern of one- to two-hour delays in sleep onset and wake times in people with normal living conditions


This occurs because the period of the person's sleep-wake cycle is longer than 24 hours


Symptoms result when the non-entrained endogenous circadian rhythm drifts out of alignment with the light–dark cycle in nature


Although this sleep disorder is more common in blind people, affecting up to 70% of those that are totally blind, it can also affect sighted people


The first report and description of a case of non 24, a man living on 26-hour days, who happened to be sighted, was "A man with too long a day" by Ann L. Eliott et al. in November 1970

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