Weighted Silk Sleep Mask
I think their tagline that hooked me a few years ago was 'sleep like you did before you had kids.' So I bought it, and I love it. Designed with the perfect balance - heavy enough to stay put and block out light completely, yet light enough that you'll forget you're wearing it. The soft silk and thoughtful sizing/straps mean no uncomfortable pressure on your eyes or head, just pure comfort.
photo from Lunya
Find it here