Like many people with light blue irises, my eyes are super sensitive so even the smallest amount of light keeps me up/wakes me up. I've tried just about every eye mask under the sun, and finally discovered this incredible $12 contoured sleep mask a couple years ago. The eye area on each side is contoured outward so the fabric is not pressing tightly against your eyes which allows you to blink freely and open your eyes if you need to. This also means that when you wake up in the morning, your eyelashes aren't crimped or bent in weird directions. If you ever get eyelash extensions, this is also the only eye mask you can use for the same reasons. Amazon prime this sucker STAT.