In bootcamp I got into the habit of doing pushups off the bed frame right before sleeping… just to burn off the last of the “alert!” swirling around in my blood. Then listening to the ancient ventilation system, which was like falling asleep on a train, whilst I would flex and relax every muscle in my body, starting from my toes.
Never would have occurred to me to do that, pushups, but in the beginning a few others were (50 racks in 1 room = A whole lotta different “settle to sleep” on command, old routines out the window, trying new things… all of which were completely visible as we slept on TOP of our sheets/blankets).
After a couple weeks (until the end 3 months later) about 1/3 of us were pushing; another third were going through photos -not enough light to read by, and reading wasn’t allowed anyway, reading was for when taking a shit, but there was enough light to see- or other flipping other things around in their hands -talking also not being allowed- whilst moving their lips. Some were praying, others singing silently, IDFK what others too far away for me to read their lips were mouthing or doing with their hands. And the last third were just motionless lumps; lay down, close their eyes, snoring followed.
In retrospect? It made sense; something gross motor, something fine motor, something imaginary or nothing at all.
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I’ve used that same trick of pushups before sleep when I’ve been places I don’t want to be, and can’t leave, too many times & places to count.
Rolling mandala/rosary beads between my fingertips, or flipping a coin around my fingers, or shuffling cards, I’ve found useful in other situations.
Singing/praying/mantras/talking would wake me up, but my son used to sing himself to sleep even before he could talk, and even as an adult prefers voices in his ears (if not his own, podcasts, etc.) to fall to sleep by.