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Synonyms
sleep·er (slḗpər)

noun 

  1. One that sleeps: a heavy sleeper who was not wakened by the burglar.
  2. A sleeping car.
  3. Children's pajamas, usually with legs that cover the feet. Often used in the plural.
    1. One that achieves unexpected recognition or success, as a racehorse or movie.
    2. A spy or saboteur who is planted in an enemy country and who lives unobtrusively as a citizen of that country until activated into clandestine operations by a prearranged signal.
  4. A horizontal structural member on or near the ground that supports weight.
  5. Chiefly British A railroad crosstie.
  6. Any of various usually small marine and freshwater fishes of the family Eleotridae, related to the gobies but lacking a sucking disk and noted for their habit of lying immobile.