Webster's English Dictionary

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sleeper

sleep.er \'sle--p*r\ n 1: one that sleeps  2: a piece of timber, stone, or 
   steel on or near the ground to support a su perstructure, keep railroad 
   rails in place, or receive floor joists : STRINGPIECE 3: SLEEPING CAR  4: 
   something unpromising or unnoticed that suddenly attains prominence or v 
   alue : as 4a: a racehorse that wins unexpectedly after performing poorly  
   4b: an article of merchandise having a value that goes unrecognized for a t 
   ime 5: a calf earmarked but not branded