I do identify with a feeling of a "floating bed," and swinging on swing sets did used to be a great provider of sensory input to me....but now that I'm an adult, I'm worried about how I'd look swinging on a swing set at a park, and even if I did want to swing on a swing set now, I couldn't bcuz these days I get motion sick from it.
But yes, I think the feelings of motion are pretty normal...that is, as long as it's not distressing for you. I think it's kind of the same thing as "treadmill feet" - when you get kind of used to moving your feet in a certain way for an extended amount of time, so your feet and legs kind of feel "conditioned" to move that way even after you're off the treadmill.
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I wish Sterling Holloway narrated my life.
"IT'S NOT FAIR!" "Life isn't fair, Calvin." "I know, but why isn't it ever unfair in MY favor?" ~ from Calvin and Hobbes