You can also hydrate your hair while you sleep with an overnight treatment. Pantene Pro-V Overnight Miracle Repair, $5.99, is a creamy hair serum that won't transfer to your pillowcase. Clinical data shows that it can repair six months of damage in one night. Sachajuan Over Night Hair Repair, $60, strengthens hair with natural moisturizing extracts. And Alterna Caviar Anti-Aging Overnight Hair Rescue, $38, fights environmental aging with Vitamin C and caviar extract.