A new study in Austria suggests falling asleep with the TV on might be messing with the quality of your sleep.  That’s because it might be causing “micro-arousals” all night, where you almost wake up. Doctors scanned people’s brains while they slept, and found that hearing unfamiliar voices, like actors on a TV show, can trigger something called “micro-arousals.” That’s when you come close to waking up.  If it happens too many times in a night, you can end up groggy the next day.