Although it may seem like a fairly basic buy, a sleep mask isn’t as simple as getting one, slapping it on and falling into sweet dreams. The primary goal is to keep out the light when trying to get shut-eye, but there are several important variables to think about when searching for the right blinders. First, you need to consider the size and shape, which will be determined by the position you sleep in and what you want to block out. The second thing to keep in mind is the purpose. Although they’re mainly for blocking out light, sleep masks can have other uses. Next, what materials have been used to make the mask? Your facial comfort will depend on it. Now, relax. Soon you’ll be sleeping peacefully in the dark.