why do I keep getting random bruises?

when I wake up in the morning I always have random bruises on my legs or arms and I don't remember how I got them. I do move at night, but I can't get bruised like that on the wall, and I never fall out of the bed. I do move around a lot tho, so maybe I hit myself in my sleep?? idk it's just weird (⁠˘⁠･⁠_⁠･⁠˘⁠) and today I woke up with a cut on my head and I didn't even notice it until I had to brush my hair and it was bloody (⁠‘⁠◉⁠⌓⁠◉⁠’⁠) I mean it's not that big, but it still hurts. how did I manage to do that? is this some spiritual thing or am I just dumb and hurt myself in my sleep.