[I'm not sure if I should respond, as I am just a very untypical NT (until proven otherwise). But maybe you will find my post entertaining.
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For me going to bed is like going to gym. I've got a queen bed just for myself, and I use a little pillow (I am very particular about pillows and their fabric). It takes me quite a long time to fall asleep, I wake up many times during night, and I need 30-60 minutes to wake up in the morning, in which time I am "half asleep" (I alternate short periods of being awake with periods of dreaming).
When I am awake or half-asleep, I constantly move the pillow and myself from one side of the bed to another, or flip the pillow, straighten it, reorient, etc. I raise my head up, do whatever is "necessary" with the pillow, and then let my head drop down. I also do it just to move my head to a different place on the pillow or bed; why does it feel necessary I do not know. I frequently change position of my body from laying on my back to laying on my stomach or on side. I usually fall asleep laying on my stomach an having head on the pillow, and I usually awake on my back and keeping my head on the oposite side of the bed. So most likely I do the "gymnastics" while asleep too. I also actively "control" the comforter while sleeping, so that it covers my body (unless it is very hot).
I often feel unsure if my legs are still there, so I usually keep them strangely tangled, and they touch each other in many spots. For the same reason I position my arms under my body, which is not a good idea as they sometimes get numb while I am sleeping and can't feel that. This does not happen often, because I usually roll or make other whole body movements and they are set free. I have slept this way for my entire life, but the queen bed surely brought many new possibilities! 