blood on my sheets, again

Had a horrible night last night. woke up a couple of times banging my head on the wall. Then, in the morning, when my little dog jumped up on the bed to great me, or so I thought, when I noticed that she had started licking my sheets, and I realized that the reason why was that I had apparently bleed during the night (not the first time that's happened.) Ah, well, can't do much about it.