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> exhaustion

This is key. Aboard a ship I was able to nap "on command" no matter the time of day or my surroundings. No mental tricks necessary.

Yeah, I was expecting Step 1 to be: Start your day with a 20 mile run in full gear.

Step 2 is to get permission to fall asleep.

Well done!

There is no step 3 — because you’re already asleep!

;)

That was more likely sleep deprivation.

Which is the actual military trick to falling asleep quickly.