I feel for U Christina. Been having nocturnal seizures 14 yrs and often find I’ve bitten the inside of my lip or more precisely my inner gum in my case.
George

I have had nocturnal seizures at night I have only ever bit my lips a couple times but my tongue has taken a beating. Even while hospitalizated I bit my tongue bad.

I have nocturnal seizures too, so sleep with a mouthpiece to keep me from biting my lips/cheeks... I'm always waking up with other mysterious cuts and bruises though 🙃

I woke up one morning with deep teeth marks across my bottom lip after having a nocturnal seizure and neither the seizure or the gashes in the lip woke me up. I woke up at my normal time when my alarm went off that morning. The funny part was even though my lip was swollen I still put my lipstick on that day🤣🤣

I grew up with nocturnal seizures from age 11. You might try wearing a mouthpiece to bed. The one the football players wear. Good Luck I hope it helps.