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Copy/pasting from one of my other comments:

Curiously, what games are you playing? I find that games that involve real world motion didn't match virtual world motion (ie, any racing or flying game), I feel sick within seconds, but games where the two worlds always match (ie, Beat Saber, Pokerstars VR, Superhot VR, Space Pirate Trainer), I could play for literally HOURS and feel fine.

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That's right. The cause of motion sickness is when vestibular input (sense of physical movement) does not match visual input. If I am standing and moving naturally in a VR world I can stay there for hours without feeling nauseous. FPS or flight sims cause VR sickness.

VR sickness is the inverse of car sickness.

- VR FPS game: Visually moving while physically static.

- Car passenger in back seat: Physically moving while visually static (car interior).

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