Issues with sleep data

Hello, I am having issues with the sleep data on my Apple Watch. Sometimes it shows the wrong amount of time sleep time/time in bed. It never shows any amount of time awake before getting sleep. For example if I’ve gone to bed at 11pm but it only logs sleep from midnight when it I was actually asleep. It looks like I’ve got straight into bed and fallen asleep immediately. Anyone else have this issue? Any fixes?