Woke up with bottom left side of lip numb/frozen

So, I woke up with the left side of my bottom lip numb/ frozen same feeling when dentist gives you an injection. It lasted only for about 30 seconds. I assume I was sleeping on my left side.
Thank you.

Did you bite it in the middle of the night. I know sometimes that’s happened to me

Not sure? That could be it. I’ve done that with my tongue.