Sense of sleeping berth possibly from Scottish English bunker(“seat, bench”), origin is uncertain but possibly Scandinavian.
Compare Old Swedish bunke(“boards used to protect the cargo of a ship”).
See also boarding, flooring and compare bunch.
One of a series of berths or beds placed in tiers.
Jane sleeps in the top bunk, and her little sister Lauren takes the bottom bunk.
1913, Robert Barr, chapter 6, in Lord Stranleigh Abroad:
The men resided in a huge bunk house, which consisted of one room only, with a shack outside where the cooking was done. In the large room were a dozen bunks; half of them in a very dishevelled state, […]
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"They're moving off," he said. "[…][T]he funny little man with the beard like a goat is going a different way from everyone else — the gardeners will have to head him off. I don't see Mademoiselle, though. The rest of you had better bunk. […]"
Kathleen A. Browne (1927) The Journal of the Royal Society of Antiquaries of Ireland Sixth Series, Vol.17 No.2, Royal Society of Antiquaries of Ireland, page 136