Knowing what types of bed sheets fit your needs can help you sleep better and prevent you from having to buy replacements every few months. When choosing your sheets, keep in mind what type of sleeper you are. Hot sleepers are better off with breathable, cooling sheets like cotton or linen, while cold sleepers should opt for something warmer like flannel. Also, consider how much they will be used and what type of people (or animals) will use them the most.