Am I the only one: Sleep Injuries

I may be the only person this happens too but there are times when I wake up and have a new injury. The injury did not occur during the day or night before I fell asleep. As soon as I woke up the injury was present. I did not get up in the night, that I knew of, and cause the injury. I have gotten several cuts on my hands while sleeping and a couple bruises on my foot. I just think it is strange to wake with an injury I did not have when I fell asleep...