noun, noun or participle which takes 'suru', intransitive verb
sleeping bunched together; sleeping in a huddle
Describes many people sleeping crowded together in one room, often on a trip or in a small space. Can be used as a noun or with する as an intransitive verb.
旅館の一室でみんな雑魚寝した。
We all slept bunched together in one room at the inn.
合宿では雑魚寝が当たり前だ。
Sleeping in a huddle is the norm at training camps.