To have woken up with bitten lips

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Just what the title says really. I woke up this morning and had pain, on one side of my bottom lip. When I looked in the mirror, it was bleeding, and I also had the same thing on the adjacent top lip. I must have bitten them in my sleep?

Has anybody experienced similar, or know what might have caused this?

(I posted this in general health, but reposted here in the hopes of a reply).

Bad dream? Coldsore?

No bad dreams, and they aren't coldsores. I have bitten my lips in my sleep for some reason.

What do you think happened?

It's possible to have bad dreams without remembering them in the morning!

I often bite the insides of my cheeks at night, especially if I have ulcers or any other swollen areas.

Hope your lips feel better soon.

Thanks, I have had bad dreams so many time before, nightmares bad enough to wake me up. I have also bit my cheeks before. The lip thing is a bit weird though, i'm abit old for a first occurrence! I've been looking it up and think its probably stress.
Thank you for replying.