My dad as well said that it was the Army that taught him how to nap--because he was so exhausted, all the time, that he either had to learn how to nap for ten minutes under a tree, or fall over dead.
For me, I have to be sure to signal my body to keep things at the dozing level, rather than deep REM sleep. Dozing is on my back and with at least indirect lighting still on. If I turn on my side, which is how I sleep at night, I'm a goner. Two hours minimum and I'm nauseous and groggy for the rest of the day.
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