Applying a hair mask in the shower may give your hair a much-needed dose of nourishment for the short term, but turning to an overnight treatment is a more effective (and longer-lasting) way to heal damaged strands. Whether it’s in the form of a sleeping mask, serum, or oil, healing your locks while you catch some zzzz’s lets the product work its magic all night long. Read on for nine overnight hair products that will give you healthier hair by morning. (Photo via Getty)
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