There are three known chronotypes, but Dr. Michael Breus is famous for discovering a fourth one.
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3/28/2026
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4/13/2026
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Sleep Doctor: If You Wake Up At 3AM, DO NOT Do This! - YouTube
The Diary Of A CEO and Sleep Doctor
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Related Claims
A person's chronotype changes with age; babies are Lions, toddlers are Bears, adolescents become Wolves, and then it sets into one of the three or four types around age 23-24 for 25-30 years.
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Chronotypes, such as early bird or night owl, are genetic and determined by the PER3 area on a person's genome.
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Dr. Michael Breus has been an actively practicing sleep specialist for 26 years.
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