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Chronotype describes an individual's natural preference for morning or evening activity, driven by genetic factors (particularly the PER3 gene). About 15% of people are extreme "larks" (morning types), 15% extreme "owls" (evening types), with 70% in between.

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1. 1Sleep midpoint = time halfway between sleep onset and wake time
2. 2Corrected midpoint (free days) is most accurate
3. 3Owls: midpoint after 5am · Larks: midpoint before 3am
4. 4Chronotype shifts with age: teens skew owl; adults become larks

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