Sleep Cooler. Block Heat & 100% of Light. ☀️❄️ A dark room is only half the battle. Sleepout curtains are designed to block 100% of light while helping reduce heat from direct sunlight, keeping bedrooms cooler, darker, and more comfortable all year long. Customers rely on Sleepout to tame hot west facing bedrooms, sunny apartments, home offices, and guest rooms. Premium blackout fabric. Official certifications. Better sleep starts here.