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In all seriousness, it is your vestibular sense misfiring in your brain. Your body is trying to adjust to the sudden change in position, and not doing so very efficiently. It is somewhat like seeing spots when you suddenly enter a brightly-lit area, your brain is being overstimulated and trying to catch up to the input. (Or it can also be from understimulation, in the case of a dark room and a soft bed, your body doesn't have enough information to figure out where you are in relation to the ground.)
People with sensory integration issues can be unlucky enough to feel that swinging motion all the time, not just at the moment they lay down.
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