Below are possible answers for the crossword clue Sleep on it.
5 letter answer(s) to sleep on it
FUTON
mattress consisting of a pad of cotton batting that is used for sleeping on the floor or on a raised frame
SHEET
(mathematics) an unbounded two-dimensional shape; "we will refer to the plane of the graph as the X-Y plane"; "any line joining two points on a plane lies wholly on that plane"
(nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
a flat artifact that is thin relative to its length and width
a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel
any broad thin expanse or surface; "a sheet of ice"
bed linen consisting of a large rectangular piece of cotton or linen cloth; used in pairs
come down as if in sheets; "The rain was sheeting down during the monsoon"
cover with a sheet, as if by wrapping; "sheet the body"
newspaper with half-size pages
paper used for writing or printing
8 letter answer(s) to sleep on it
MATTRESS
a large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed
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