Green’s Dictionary of Slang

demi-doss n.

[SE demi, half + doss n.1 (1); ? one gets only half a bed or the comfort is substandard]

(UK tramp) a penny bed.

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[Scot]Aberdeen Jrnl 5 Nov., 2/5: Others, unable to find the coin wherewith to obtain even a demi-doss, i.e., penny sleep .