Ladies and gents, I’d like to introduce you to overnight hair masks, the nourishing formulas that repair your hair while you sleep. I know the the idea of an overnight hair mask might sound like a sticky mess (who wants a rich hair mask smeared all over their silk pillowcase? “Overnight hair masks let your hair soak in deep hydration and nourishment while you sleep, making your mane softer, shinier, and more manageable by morning,” says Leo Izquierdo, co-founder of IGK Hair Care. “The convenience of leaving it on overnight means you don’t have to wait around in the shower—just apply and forget it! Shop the Best Overnight Hair Masks of 2026Best Overall: , $120, $120 Best Oil Treatment: , $34, $34 Best for Protection: , $34Whether you’re looking for a shine boost, to strengthen weakened strands, or give your hair some consistent TLC, we polled hair experts and ELLE editors to find the best overnight hair masks on the market guaranteed to transform your hair while you sleep.