If you're feeling sleepy all day, your tired state might have more to do with when your alarm woke you up than how much sleep you got. That's where Sleeptracker can help, figuring out exactly when you are in your lightest sleep stage, and waking you up then instead of when you're in a deep sleep. With its on-board accelerometer, it senses when you're moving around a lot, pinpointing exactly when you're in a light sleep state. It's been around for a while, and when we reviewed it last year, we found it effective but not miraculous. Now its makers have upgraded the watch that you wear to bed.

This improved Sleeptracker Pro—apparently for those who sleep professionally—has a USB port that lets you download your sleep data to a PC, and then review that sleep history on the included software. Another welcome new feature is a vibrating alarm that works either by itself or with the audible alarm. It also improves on its predecessor's cheap construction—its new form factor appears to be more substantial. The Sleeptracker Standard is still available for $149, but if you feel like joining the sleep pros, the Sleeptracker Pro will cost you $179. — Charlie White

Via Sleeptracker