1. [Noun]: a rester who is sleeping

2. [Noun]: 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

3. [Noun]: an unexpected hit; "that movie was the sleeper of the summer"

4. [Noun]: a piece of furniture that can be opened up into a bed

5. [Noun]: one of the cross braces that support the rails on a railway track; "the British call a railroad tie a sleeper"

6. [Noun]: an unexpected achiever of success; "the winner was a true sleeper--no one expected him to get it"

7. [Noun]: tropical fish that resembles a goby and rests quietly on the bottom in shallow water

8. [Noun]: a passenger car that has berths for sleeping

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