Not worth trying

Used 20% of my Apple watchs battery to monitor one short night of sleep! I dont want to have to charge my watch both morning and night. No access to any of the statistic features unless you buy the premium version. I at least wanted to review how well it tracked one night of before investing $5 in it, but you cant. The user interface is not great either--way too hard to shut off the alarm, for example. If it used less watch battery it might be half decent, but there are plenty of other flaws. I changed from a Fitbit Charge HR recently, and their sleep tracking was so much better.

Ymos about Pillow: Sleep Tracker, v3.0.1