Heating blanket safety   

An electric heating blanket can be a nice, warm comfort during the cold weather months if properly used and maintained. There are two types of blankets — underblankets (also called heating pads) that are placed directly on the mattress, and overblankets, which are treated like other blankets you'd snuggle under. They are not to be used interchangeably or at the same time. Most manufacturers advise against using a heating blanket on waterbeds, sofas, bunk beds, or mechanical beds.