noun
sleeping posture; sleeping position
Refers to the way a person's body is positioned while sleeping, often used when describing restless sleepers or habits.
彼は寝相が悪くて、よく布団から落ちる。
He has bad sleeping posture and often falls out of the futon.
赤ちゃんの寝相を直してあげた。
I adjusted the baby's sleeping position.