Blinds let you keep the sun out (and also stop internal light from escaping) which might mean the difference between you being able to sleep at night or not; or even the ability to see your TV screen for daytime viewing or not. There are three types of blinds: blackout, sunscreen, and sheer. Blackout blinds are good for rooms that need complete darkness. Sunscreen blinds are good for rooms where you want some sunlight. Sheer blinds are good for rooms where you want natural light.