Best sleeping mask recommendation?

i have combo dry skin, doesnt matter if its applied cream/gel or literally as mask like biodance. would love to hear your HOLY GRAIL, something that makes a difference not just gimmicky or 'nice'. I've tried many korea skincare that is ok, totally can live without. Thanks so much!
P.S. Would prefer some cooling effect, but its ok if there's none, just a lil extra to feel good. lol