It's not just the heating pads to watch out for. My husband burned his back pretty good and is actually scarred from a thermo wrap. The kind that heats up it's self and you put them on. He put one on after pulling a back muscle and wear it to work. I guess he had it on longer then he should of. But since it wasn't a "heating pad" that was plugged in and all he thought it wouldn't get hot enough to burn him. But he was burned bad enough to have a scar now. So just a heads up. Might not want to fall asleep with those on as well.