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It's an acquired skill, being able to sleep anywhere. Military people tend to acquire it by necessity, Asians seem to have cultural reasons for it.

It's not too hard to acquire it with some practice, every time you feel like it would be a good time to have a nap, close your eyes and try to have a nap. For a while, you won't actually get to sleep, you'll just be lying or sitting there with closed eyes, but after trying for a while, you'll actually start napping or sleeping.

These days, if I'm a passenger in a vehicle for a > 30 minute trip, you're almost guaranteed to find me sleeping.

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