Ahhh, sleep. There's nothing better than a nice, long, uninterrupted. Awwgh. I can't sleep when there’s. But d'ya ever notice: noise doesn't wake everyone. Now scientists have a better idea why. Because sound sleepers show a certain brain rhythm when they doze, findings published in the journal Current Biology. To study the brain waves of a good night's sleep, scientists invited volunteers to snooze in the lab. While the subjects caught some Zs, the researchers monitored their brain activity. They then sexist the sleepers to or [NOISE]. And they found that those who were able to slumber subjected through all the showed more short bursts of faster brain waves. This activity, the scientists say, is the brain's way of blocking out the and the while you're trying to rest. The scientists don't yet know of any way to boost those sleep-saving brain waves. So until then, shut the door, make sure the late show's on a timer, and try to have sweet dreams.