Motion Sickness and Sea Sickness Motion sickness can happen when your brain receives mixed signals from your eyes, inner ears, and body about movement. It may occur in a car, boat, airplane, train, amusement ride, cruise ship, virtual reality setting, or even while reading during travel. Sea sickness is a type of motion sickness that happens during boat, cruise, or water travel. Some people only feel mildly queasy, while others may have intense nausea, vomiting, dizziness, sw