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My Dad always took powernaps and still does. He has the ability to sit down in just about any reasonably comfortable chair, and go to sleep on command. He can then wake up 5, 15, or 30 minutes later and be fully alert. Noise, light, temperature - doesn't worry him.

He laughs about it but it's got to be a skill built up over years by practicing.

The one trick he did teach me for a mid-day nap was to lie on your back on the floor and put your legs up on a chair (calf muscles on the seat, feet against the backrest). For some reason it really seems to help, I assume it's circulation related.

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