stupid finger

Is it possible to jam a finger in your sleep? A month or so ago i dislocated my finger playing Australian Rules Football. As of yesterday i thought it was at 99% strength. But today when i woke up, it hurt to bend it. (im editing this post and using the word "hurt" to not freak out my parents). So bascially the only way was if my punk roommate came in and slammed my finger in a door while i was asleep or i rolled over on it and jammed it. Either cause would be kinda odd dont you think?