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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 the 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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