How the Zeo sleep device works around the limitations of home monitoring

How the Zeo sleep device works around the limitations of home monitoring - O'Reilly Radar: "The Zeo is part of a trend toward using technology to monitor our own bodies. People have always been concerned about their health, of course, and have tried different things to see what works (including rather absurd superstitions). But now there are ways to bolster one's curiosity with real scientific data."