My watch 5 does not know when I am awake at night. It logs my sleeping when I say I should be sleeping but when I wake up in the middles of the night and read for a few hours it does not notice that I am awake, even if I use my phone or my watch. I all relies on my sleeping range to determine when I am asleep. No at all accurate. If I am still up when I should be asleep it monitors that I am sleeping the next day on the app. I get monitored that I am getting over 8 hours of sleep a night where as the reality is it is more like 4 -5 hours. In the watches defence my resting heart rate is extremely low at 43 beats so the difference in resting and sleeping will not be much.
