bunk (up) together
To share a room, bed, or other sleeping space with another person. You two will need to bunk together because we weren't able to reserve enough hotel rooms for everyone. I'll never forget the motley crew I bunked up together with at camp that summer.
bunk (up) together
[for two or more people] to share a bed, a bedroom, or a tent. Shall we bunk together? My tent is big and you can bunk up with me.