It took a while to find the "help" tab on my computer when I went to my fitbit account. I guess it took so long because I didn't realize I needed to look there. Their articles are more like sentences...no wordy writers.
But last night was the first time I'd activated the sleep function. The wrist band was very comfortable and easy to ignore. Turning on the sleep function involved holding down the tiny button on the device until it started a function that looked like a stopwatch.
When I logged in on my computer this morning, it said I was in the bed 3 minutes before going to sleep, I woke up 6 times (and it showed when) and had 97% sleep efficiency. It said I slept 6 hours and 53 minutes. I think maybe it thought I woke up when I moved or turned over. I am not aware of any of that. But that might be what the sleep apnea clinics record more tediously.
So if a person has a fitbit and it shows poor sleep efficiency, it might be a good idea to check with a sleep clinic because sleep apnea can cause strokes and even death.