Bunk, shorty, cabin, mid sleeper and high sleeper: what each one is for, and the published heights of a few real frames.
A bunk stacks two beds. A mid sleeper is a lower raised bed with space underneath. A high sleeper is one high bed, often with a desk. A cabin is a raised bed with a den or storage. The upper bed of anything with a base 600 mm or more off the floor carries the under-six warning.
A shorty bunk is a lower, usually shorter bunk for a tight ceiling. Boori’s typical mattress is about 75 × 175 cm, and their typical top surface is about 120–130 cm. Confirm both figures on the model you buy.
A high sleeper puts one bed at the ceiling and a desk underneath. The Ocean listing is 178.5 cm tall before the mattress. You still need sitting headroom, a chair that pulls out, and the maker’s weight limit if they publish one.
A cabin bed trades floor for a den or for drawers. If the mattress base is 600 mm or more above the floor, treat it as a high bed: the under-six warning and the marked mattress thickness apply.