In The Past Month I Have Woken Up In The

In the past month I have woken up in the middle of the night itching all over my arms and hands,legs and back . It is so bad I cant go back to sleep until a couple of hours later when the itching subsides. this only happens during the night during the day im ok and I don't itch at all. Right now im taking the blood thinner warfarin with aspirin and metoprolol and lovastatin. A couple of months ago I started taking Tylenol pm to help me sleep. I would like to know if that has any thing to do with my itching at night only