I got a ForerunnerS just over a week ago. It's not tracking my sleep. I am wearing it all night. every night. Most nights it does not record REM, deep, etc. Some nights it does not track any sleep. I was using AnyConnect for IOS. I logged into Garmin Express from my computer and synced my Forerunner there and still the same issue. I'm about to return this to REI and get a FitBIt.