🌙Chronotype Calculator
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.
- 1Sleep midpoint = time halfway between sleep onset and wake time
- 2Corrected midpoint (free days) is most accurate
- 3Owls: midpoint after 5am · Larks: midpoint before 3am
- 4Chronotype shifts with age: teens skew owl; adults become larks
Sleep 11pm · Wake 7am=Sleep midpoint = 3am → Intermediate chronotypeOwl = midpoint >4am; Lark = midpoint <3am
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Fun Fact
Social jet lag — the discrepancy between biological and social clocks — affects over 70% of working adults. Every hour of social jet lag correlates with a 33% higher chance of being overweight.
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