Using your MacBook on a train can trigger motion sickness for the same reasons it happens in cars. The train moves unpredictably, causing a mismatch between what your eyes see and what your body feels. This conflict leads to nausea and dizziness, particularly when you focus on a stable, non-moving screen.

To mitigate these symptoms, try facing forward in the train and glance outside occasionally to stabilize your vision. You can also use Carsick.app, which synchronizes your MacBook’s display with the motion of the train, helping to prevent motion sickness by keeping your brain's signals in harmony.