The recommendation for time asleep and percentage they are saying like if you fell asleep at 10 and woke at 6 and don’t have any memory of being awake for a prolonged period of time that is an 8 hour sleep. They aren’t deducting micro awake times or 1 to 2 minutes a few times a night.
Also if you take the total time slept and recalculate the percentage without the awake percentage: when they refer to needing 13 to 20 percent of deep sleep that’s of your total time asleep. So you would just take the deep or rem time in minutes divided by the total time asleep and the percentage is higher then FITBIT says because they include awake time and micro awake times.
Also since FITBIT includes awake times of 30 seconds or so I just change my time asleep goal to 6 hours and 45 minutes which would be more then the minimal 7 hours recommendation if you have only 30 min of fit bit awake time.
