"If you've ever felt your eyelids droop for just a fraction of a second during some mundane task — like staring at a computer screen or driving down the highway — you've experienced a phenomenon known as "microsleep." Discover Magazine's blog The Crux recently spotlighted the experience, which happens when key parts of the brain switch off for a few seconds at a time. This means that, while you're not quite asleep, you're certainly not awake either ..." (read more)