Bunk

A sleeping berth aboard a vessel, often built into the accommodation.

Bunks may be single, double, stacked, pipe-framed or formed by converting seating. Offshore arrangements can include lee cloths, boards or shaped cushions to help retain an occupant as the vessel heels and moves.

A usable sea berth needs ventilation, dry bedding, secure structure and a clear escape route. “Bunk” can describe the sleeping place rather than a particular construction, and not every berth is permanently built in or especially compact.