The same thing happened to me at the Bellevue Wa Sheraton in July. It was 10pm, and I did call down to the front desk. The desk clerk was disgusted and sent someone up right away, to change the sheets. I was kind of creeped out by the whole thing
I woke up the next morning to find the bill under my door. I am a typical Canadian that does not complain too much, but I went downstairs and voiced my concern to the desk clerk. She said "are you sure it was blood?" and she really questioned me. Bottom line she compt the room, but not without a hassle. I didn't appreciate that. My 2 cents....MF