This is an unusually bad one but last night's sleep tracker kept recording sleep even though I'd been awake for 2 hours. The app clearly recorded me as awake but classed it as part of my sleep record. Guess what... I WAS AWAKE!
It happens regularly and when I think about it I'll click on the app to stop it recording but it should just delete that last section of awake automatically. Or at least give the option to delete the last section of awake time.