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Friday, October 9, 2009

Circadian clock is about dusk and dawn, not day and night

Of particular interest for all who have sleep disorders of any sort.

Ever stood awake for all night only to suddenly feel terribly sleepy precisely at dawn? There is an explanation: the circadian clock. It used to be believed that the neurones involved in it (the superchiasmatic nuclei, SCN, of the central brain) were firing like mad at day and virtually inactive by night, at least in normal people. But it has now been found that what the SCN does in fact is to signal dusk and dawn, remaining essentially inactive for the rest of the day and night.

Source: Science Daily.


Davidski said...
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Maju said...

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