Why do we jolt as we fall asleep?

Have you ever started to fall asleep and then suddenly – whoa! – you jolt awake? What’s up with that? We asked sleep specialist Chris Winter to help us find the answer. Got a question that has you losing sleep? Send it to us at BrainsOn.org/contact, and we’ll pull an all-nighter to find the answer! See omnystudio.com/listener for privacy information.