noun, noun or participle which takes 'suru', intransitive verb
turning over in bed; rolling over; tossing and turning
Refers to the physical act of changing one's sleeping position. Often used in the phrase 寝返りを打つ.
See also: 寝返りを打つ
赤ちゃんが寝返りを打った。
The baby rolled over in bed.
昨夜は暑くて
Last night was so hot I tossed and turned many times.
noun, noun or participle which takes 'suru', intransitive verb
betrayal; double-crossing; defection
Metaphorical extension: switching allegiance, betraying one's group or side. Often used with する to mean 'to betray' or 'to defect'.
彼は敵側に寝返りした。
He defected to the enemy side.
仲間の寝返りで計画が台無しになった。
The plan was ruined by a comrade's betrayal.