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Summary
On episode 173 of 40+ Fitness, Coach Allan sits down with Dr. Michael Breus, a practicing sleep specialist and author of The Power of When, who developed the lion, bear, wolf, and dolphin chronotypes after a patient told him she wasn’t sleeping badly, she was just sleeping at the wrong time.
Michael explains how each chronotype has its own natural sleep window, strengths, and struggles, and how matching your schedule to your type, rather than fighting it, changes everything from productivity to relationships.
Allan and Michael also get into the practical side: how couples with mismatched chronotypes (Allan is a lion, his wife is a dolphin) can communicate better once they understand what’s actually driving the friction.
Links
- https://thepowerofwhenquiz.com
- https://thepowerofwhen.com
- https://thesleepdoctor.com
Key Takeaways
- There are four chronotypes: lion, bear, wolf, and dolphin. Each is built around a natural sleep-wake window rather than the old “morning person or night owl” binary, and a 35-question quiz identifies which one you are.
- Bears make up about 55 percent of the population and set the social norm. They wake and sleep close to the sun’s schedule, which is why the workday and social calendar are built around bear hours.
- Wolves are the late-night creatives penalized by a 9-to-5 world. They hit their stride around 11:30pm to 1am and often get labeled lazy, even though many are highly productive on their own schedule.
- Dolphins are the true insomniacs of the group. Highly intelligent and perfectionistic, they sleep unihemispherically in Michael’s framework, meaning part of the brain never fully switches off, which makes consistent rest hard to find.
- Sleep needs vary by chronotype, not everyone needs eight hours. Lions and dolphins tend to run on six to seven hours, while bears genuinely need and love more sleep than that.
- Educating your partner about chronotypes defuses relationship friction. A dolphin and lion pairing, like Allan and his wife, can work well once both sides understand the other isn’t being antisocial or lazy, just wired differently.
- Hormone timing points to a best time for sex. Testosterone, estrogen, and cortisol are higher and melatonin is lower in the morning, which is why Michael’s research favors weekend morning over the more common 11pm convenience slot.
- Light therapy can nudge your chronotype in either direction. It can shift a wolf a little more toward bear hours or a lion a little later, but it only works if you use it consistently every day.
“I’m not convinced it’s always the best thing. I think actually being a bear can have several advantages to it.”
Dr. Michael Breus
