Blocking out light is an important factor when you're trying to fall asleep because darkness allows for your the production of Melatonin, which allows you to fall asleep naturally. However, if you have too much external light coming in to your room, then you're ability to fall asleep quickly diminishes. By using a Mars Wellness Contoured Sleep Cover, you're blocking out the light without causing pressure on your eyes, which allows for you to fall asleep quickly, while still allowing for REM sleep.