Why do I get so sleepy riding in a car?

If you’ve ever been on a long car trip, you may have noticed that you start to feel sleepy as the car moves. Is it because the seats are so comfy? Is the radio hypnotizing you? Are the floor mats sprinkled with secret sleepy dust? We asked neuroscientist Aurore Perrault to help us find the answer. Got a question that’s driving you nuts? Send it to us at BrainsOn.org/contact, and we’ll help dream up an answer. See omnystudio.com/listener for privacy information.