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sleeper has 7 distinct synonyms spread across 4 of its 9 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
Synonyms, antonyms and the broader and narrower relations for sleeper come from Princeton University’s WordNet. Full sources and licences.
an unexpected achiever of success
“the winner was a true sleeper--no one expected him to get it”
one of the cross braces that support the rails on a railway track
“the British call a railroad tie a sleeper”
a passenger car that has berths for sleeping
a piece of furniture that can be opened up into a bed
tropical fish that resembles a goby and rests quietly on the bottom in shallow water
an unexpected hit
“that movie was the sleeper of the summer”