Apple Watch Ultra isn’t recording sleep

Hi all, my ultra watch isn’t recording my complete sleep or when it does show it, the amount of sleep and the length of sleep is completely off. Due to some circumstances, I’ve had to change my sleep schedule 2 times, and I thought maybe that was it. Has anybody else had this issue? Or any idea about what it could be? My watch is charged every other day, has never died and it fits snuggly against my wrist