寝返り

1. Origins, structure, and basic meaning

• Structure: 寝返り is read as ねがえり and is a noun for changing the direction of one’s body while lying down.
• Basic usage: Use the conventional 寝返りを打つ for turning in bed and 寝返りをする for a baby rolling over.

2. Common pitfalls and similar expressions

• Choice of accompanying verb
  • 打つ commonly forms the set expression for restless turning, while する can describe the developmental act of rolling over.
• Not the betrayal sense here
  • Related forms can also describe switching sides, but both supplied examples concern the physical movement of the body.