Overnight Beauty Sleep Nourishing Serum For Dry Hair. Nutritive 8H Night Serum Deeply Nourishes, Detangles The Hair And Provides 8H Of Overnight Nourishment* For Sublime Morning Hair That Will Feel Soft, Easy To Style & Protected. Leave-In Overnight For 100% Absorption And A Lightweight Feel In The Morning. *Instrumental Test, After Application Of Bain Satin 2 Shampoo + Masquintense Hair Mask + Hair Serum.