Many pop songs these days are so catchy they can be torture—stuck in your head on a constant loop. It’s annoying, sure, but it can also mess with your sleep. Earworms affect your brain. Michael Scullin has been studying how memorable music affects sleep. He’s a professor of psychology and neuroscience and directs the Sleep Neuroscience and Cognition Laboratory at Baylor University. (Segment produced by Lynsey Call)