Buy It Now: $100, Amazon

Zeo's Sleep Manager Mobile uses a wireless rechargable headband to read your brain waves. Yes, that's right. Your brain waves. Place it on your head while you sleep, and it collects data, then transmits it to your phone or tablet so you can review the results in the morning. Zeo will give you a sleep score that measures ratios of deep sleep, REM activity, wake time, and times woken, all to help you decide if you need to make some changes to maximize your sleep.