It's called cybersickness or sometimes barfogenesis. This happens when the eyes see movement, but the body does not sense movement. DMT can cause the eyes to see movement that isn't there. This can sometimes trigger cybersickness. Most psychedelics can cause this in certain people, even LSD on occasion. The harmala alkaloids are notorious for causing cybersickness at high doses because they give you a sense of movement that’s not real. This leads to cybersickness.
Cybersickness is a built in response in humans. Not all people are sensitive to it, but some are really sensitive to it. Whenever the brain picks up movement in the eyes that makes it appear that the person is in movement, but the balance sensors in the ears do not sense the movement, this mismatch of signals tells the brain something is wrong and so the body attempts to eject whatever poison it may have consumed that might be causing the mixed signals.
Certain video games are notorious for triggering cybersickness. The basic principle is the same: the eyes see movement on a large screen but the ears do not sense movement, these mixed signals trigger nausea. Even though nothing was actually eaten, the body assumes the mixed signals are caused by ingesting a toxin and so it attempts to rid the body of the toxin by causing nausea.
1000 mg of ginger root is a good antidote for cybersickness.