David Pogue tests the Zeo, an alarm clock that comes with a headband that measures your brainwaves to analyze how well you sleep.

Zeo, Inc., formerly Axon Labs, is a private company founded by Brown University students. Established in December 2003 and headquartered in Boston, MA, it has created an alarm clock that monitors sleep states (e.g., REM) and attempts to wake people up in the best stage of sleep.

The state of sleep is detected by a headband. A bedside base unit awakens the sleeper during the last light sleep phase before the desired waking time[3]. The company has also developed and marketed a personal sleep coaching device which allows users to measure and analyze their sleep patterns.