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Wordage.info / sleeper

Exact Match:

an unexpected hit; "that movie was the sleeper of the summer"
tropical fish that resembles a goby and rests quietly on the bottom in shallow water
a piece of furniture that can be opened up into a bed
pajamas with feet; worn by children
a rester who is sleeping
an unexpected achiever of success; "the winner was a true sleeper--no one expected him to get it"
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