But oh, Space Mountain, how you also sometimes make us feel quite ill! This classic in Magic Kingdom is a high-speed roller coaster in the dark, with sudden drops, jerky turns, loud noises, and some repeated spinning.

Motion sickness on Space Mountain is a relatively common occurrence due to the unique way the ride stimulates the human vestibular system. Unlike many modern "extreme" coasters, Space Mountain’s top speed is actually quite modest (around 28 mph), but the experience is intensified by the fact that it takes place in near-total darkness. Motion sickness happens when there is a sensory disconnect: your inner ear feels the sharp turns, sudden drops, and centrifugal forces, but because you cannot see the track ahead, your eyes cannot provide the visual "lead" the brain needs to predict the movement. This "unexpected" motion is a primary trigger for nausea and dizziness. Furthermore, the vintage seating configuration in some versions of the ride (like the single-file rockets in Florida) can feel a bit more "rattly" and confined, which adds to the discomfort for some. To minimize the risk, riders are often advised to keep their eyes open and focused forward on the glowing lights or distant stars rather than looking at the floor of the vehicle. If you are particularly prone to vertigo or sickness in cars or on boats, Space Mountain is one of the more likely attractions at Disney to cause a reaction.