A Kickstarter-funded mask does more than meets the eye, reports Wired.

The NeuroOn contains four sensors that measure brainwaves, eye movements, muscle tension and blood-oxygen levels; two blue LED lights; and a built-in vibrate mechanism that acts as a silent alarm. Your brainwave frequency reveals depth of sleep, while eye movement indicates REM sleep, which means the brain is resting. The NeuroOn detects these, and will wake the wearer when an REM phase is complete.