Dizziness while using a laptop in a car stems from the conflict between your visual and vestibular systems. Your eyes focus on a stationary screen, but your inner ear senses the car's motion. This disparity leads to sensory confusion, resulting in dizziness or nausea.

A simple way to help is to stop and look out the window, allowing your brain to reconcile the motion. Alternatively, try using Carsick.app, which adjusts the visuals on your MacBook to move in sync with the vehicle, helping reduce dizziness by creating a more consistent sensory experience.