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Association of intrinsic circadian period with morningness–eveningness, usual wake time, and circadian phase.
Link between natural body clock length, morning-evening preference, typical wake time, and daily timing
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Abstract
Circadian period was correlated with morningness-eveningness, circadian phase, and wake time.
- Morning types have a circadian pacemaker that is set to an earlier hour compared to evening types.
- A month-long inpatient study assessed intrinsic period, a key characteristic of the circadian system.
- Participants completed a morningness-eveningness questionnaire, linking their biological clock to behavioral traits.
- Findings suggest that the biological clock's timing may influence preferences for morning or evening activity.
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