chronotype

noun
chro·no·type | \ˈkrō-nə-ˌtīp \

Medical Definition of chronotype 

: the internal circadian rhythm or body clock of an individual that influences the cycle of sleep and activity in a 24-hour period It is also true that we are increasingly sleeping outside of the times normally dictated by our internal circadian clocks (our “chronotype”).Science, 1 June 2012

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