Ok, it is clear to me that the positive reviews were from dev. I am not one, so no five or four stars from the user. Here are the pros: shows heart rate, shows sleep cycles, shows length of quality sleep. Here are the cons: out of 10 uses 3 were recorded. There is no rhyme or rhythm to the reason the app stops working. Some times it works, sometimes it records nothing.
Tigerm about Sleep Tracker - Sleep Pulse 3