It is because the inner ear tells your brain you are moving, but your eyes show that you are staying still, since you are looking at a stationary object. The two different messages confuse your brain and body and you feel nauseous. It’s also why people might feel nauseous when experiencing vertigo. Another term for this is motion sickness.
If I read in the car it helps if I look up every so often, can see things moving in my periphery, or am laying down while I read.
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