When the Sandman evades us, some may slurp wine or maybe whiskey to hasten their Zzs. While experts have known for years that pre-slumber alcohol causes poor sleep, researchers finally reveal why: drinking interrupts our brain waves as we doze.
The proof? Test subjects imbibed then headed to bed at a sleep lab. To measure the electrical activity in their brains, the volunteers hit the sack wearing electrodes on their scalps—a test known as an electroencephalogram (EEG).