The Zeo personal sleep coach is a device that can analyze your sleep patterns to help you determine habits and behaviors that may be helping or hindering your sleep cycle. It can also teach new ways that may help you get a better night’s rest. It consists of a bedside display module and a wireless headband. I’ve tried other sleep devices that have used wrist straps, so I was surprised to see that this one uses a headband. The Zeo looks impressive, but the price looks kind of scary at $400.