Two nights now, my 81 year old father has woken up to find his pillow, and duvet and bedsheets soaked in blood. He has been totally unaware it has happened. Now it has also started happening in the day time, quite suddenly. Any idea as to what it could be, or should we worry at all? He does not suffer from high blood pressure. He does not have any headaches or dizzyness. He is in a wheelchair, so he is not very active. However, the bleeds in the day seem to coincide with activity (such as getting up from bed, moving from wheelchair to easy chair, etc)