Oh My God! CK...DO NOT MESS WITH ELECTRICITY!! Don't forget what happened when you were trying to build the feather burner!! If you want to sleep warm...Sweatpants, sox and a HOODED sweatshirt inside your bag. A pair of slip on somethings for your feet when you need to piss at 3am. You'll be fine if you follow this advice. The nice thing about this outfit is that when you need to pee, due to the sweatpants, sweatshirt, etc. you don't hesitate to do it....which means you'll sleep well after answering nature's call. Luv ya buddy!