Noun
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an unexpected hit
"that movie was the sleeper of the summer"
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tropical fish that resembles a goby and rests quietly on the bottom in shallow water
- sleeper goby -
a piece of furniture that can be opened up into a bed
-
pajamas with feet
worn by children
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a passenger car that has berths for sleeping
- sleeping car - wagon lit -
one of the cross braces that support the rails on a railway track
"the British call a railroad tie a sleeper"
- railroad tie -
an unexpected achiever of success
"the winner was a true sleeper--no one expected him to get it"
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a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal
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a rester who is sleeping