My fitbit doesn’t always record sleep. A week or two ago I slept 2 to 3 hours later that the fitbit recorded. Two days ago I took nap, and it was not shown at all. It did show me I was only getting 4 to 5 hours of good sleep most nights. but it shows me awake during the night a lot more than I think I am. I know they say it could be restless sleep. I get up every hour or two to go to the bathroom and usually fall right back to sleep when I lay down. I know I am not getting enough sleep. Even days of more than 10,000 steps, I do not sleep well although I get an occasional night of 9 hours or so every couple weeks.