noun
bed hair; messy hair from sleeping
Refers to hair that becomes disarranged or sticking up after sleeping.
朝起きたら寝癖がひどくて、直すのに時間がかかった。
When I woke up in the morning, my bed hair was so bad it took a while to fix.
noun
habit of moving in one's sleep; sleeping habit
Describes a person's tendency to toss and turn, kick off blankets, or move around while asleep.
彼は寝癖が悪くて、よく布団を蹴飛ばしている。
He has a bad sleeping habit and often kicks off the futon.
Compound of 寝 (ne, 'sleep') and 癖 (kuse, 'habit'). The reading ねぐせ is a rendaku form.