Because the body finds and sets the rhythm to be an autonomous function. When it isn’t used to swapping back and forth, then the residual autonomous signals remain for a while until the brain recognizes they are no longer needed. When you live/work on boats, this quickly goes away as the brain recognizes when it is and isn’t needed, and has trained to a higher degree of balance where you no longer fall down at all as you are always tuned for a stumble.
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