Sentence:  Now , Adam , in the gray light of afternoon , stared across at the hut opposite his tent , and thought of Simms Purdew lying in there in the gloom , snoring on his <WSD>bunk</WSD> , with the fumes of whisky choking the air . 
Meaning of the word marked with <WSD> tags:  a bed on a ship or train; usually in tiers