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>...home remodeling, yard work, or canoeing...

Are you sure it's actually the physical exhaustion and not the hours of exposure to direct sunlight which calibrates your circadian rhythm?

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I'm fairly convinced that my body wants a 27-hour day, when external forces are removed. Being in the sun all day is certainly more tiring than indoor activity. The physical exertion seems to work well enough without the sun. I used to live in Cayman and got tons of sun daily, and still slept better after exertion.

Home remodelling is an indoor activity though.

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