Review (4/5): Almost perfect
I purchased an sleep mask just like this in a store and, when it went missing, searched for it high and low until I found it here on Amazon. The mask blocks light well with little or no light leaking in around your nose and none around the eyes. The contoured eye coverings place no pressure on your eyelids. I never felt comfortable sleeping in a traditional sleep mask until I used this style. I can even open my eyes in my mask and my lashes don't even brush it.
The comfort in wearing meant I quickly adjusted to its use and now can't hardly sleep without it. As someone who has had trouble sleeping and finds napping almost impossible, having the routine of perfect dark when I sleep at night has allowed me to build a trigger. Now, when I need to sleep early, want to catch a nap, find myself in a plane, or other times I might ordinarily find it hard to sleep, I can place my mask on and it signals sleep perfectly. It's improved my sleep length and frequency, as well as reduced the time it takes me to fall asleep, which I think anyone could appreciate.
My only gripe is that, while I thought this one was exactly like my previous mask, there's a little difference. There's a little plastic piece on the side of the elastic that joins loops for the adjustment system and they sit very near my ears. I can sometimes feel it digging in and I never remember feeling that on my previous mask. For occasional use, you may not notice it, but using them nightly, the little part can bother me sometimes. My solution plan involves breaking the part and replacing it with something soft or hand-sewing that connection point. Customization is a very small price to pay for the amazingly comfortable contoured foam that makes up the main body of the mask.