noun
fixing bed hair; treating bed head
Refers to the act of fixing hair mussed by sleep, often by wetting, combing, or using a product.
See also: 寝癖
朝、寝癖直しに時間がかかる。
It takes time to fix my bed hair in the morning.
noun
bed hair treatment product; anti-bed-head spray
A product such as a spray, mist, or lotion used to tame bed hair.
この寝癖直しは、髪がしっとりまとまる。
This bed hair treatment leaves your hair smooth and manageable.
寝癖 is the bed hair itself; 寝癖直し is the act of fixing it or a product for that purpose.
Compound of 寝癖 (bed hair) + 直し (fixing, from 直す).