noun, noun or participle which takes 'suru', intransitive verb
turning over in bed
Refers to the act of tossing and turning while lying down, often due to restlessness or inability to sleep. Can be used as a noun or with する as an intransitive verb.
暑くて何度も反側した。
It was so hot that I tossed and turned many times.
心配事があって、一晩中反側し
I had worries and was tossing and turning all night.