Oh, see, that's where you've gone wrong right from the start — that word, merely. Implication being they're only beds and nothing more when in fact, they're so much more. A bed is a bed, generally a flat surface, serves a function, off you go.

But a bunk bed, now you've got a ladder, now it's an adventure!

[ If it sounds anything like the Doctor would be the sort of bunkmate to stay up all hours chattering away, well, that's not far from the truth.

When he does miraculously pause his words to look over at the newcomer, it will be evident the Doctor was sorting through bits and bobs himself, holding a journal of some kind in his hand. ]

Looking for anything in particular, or just looking? I find going into a new place with no expectations yields the most interesting results. Open mind — never know what you'll find.