Why do people have common dreams?

Sometimes people dream about similar things, like losing teeth, being chased by monsters, or forgetting to study for a test. Why are there some kinds of dreams that people share? We asked dream researcher Tore Nielsen to help us find the answer. Got a question that’s just dreamy? Send it to us at BrainsOn.org/contact, and we’ll share the answer with you. See omnystudio.com/listener for privacy information.