I woke up with a burn blister on my side were did it come from
You may have got a friction burn and didn't know it. When something causes an abrasion like a rug burn, it can potentially become a blister. Are you sure if it is a "burn" blister? Sometimes a person may develop a blister if he/she has a reaction to something. Do you have any clue as to what may have caused it? What does it look like? Is it reddened or does it just look skin-colored with yellowish fluid inside? If it is reddened, it is from an apparent abrasion of some sort. If it is the latter, you can bet you may have a skin reaction to poison ivy or some other irritant.