If there is Head Lice going around in your family as a precautionary measure cleaning immediate bedding ( pillowcases, comforter and sheets) regularly wash them and put them in dryer for about 30 min.. if there are any Head Lice the heat from the dryer would kill them .. is the comforter can not fit in the dryer then isolate it ( either put it in a separate room or garbage bag) for 24 hours.. REMEMBER this is only precautionary cleaning, most likely there’s nothing on your sheets