Are you an early bird or a night owl? Why scientists are moving beyond these groupings

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February 14, 2026
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This story is part of CBC Health's Second Opinion, a weekly analysis of health and medical science news emailed to subscribers on Saturday mornings. If you haven't subscribed yet, you can do that by clicking here. Are you a night

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Are you an early bird or a night owl? Why scientists are moving beyond these groupings

Are you an early bird or a night owl? Why scientists are moving beyond these groupings

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