n.

a rester who is sleeping

同義詞：slumberer

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

an unexpected achiever of success

"the winner was a true sleeper--no one expected him to get it"

one of the cross braces that support the rails on a railway track

"the British call a railroad tie a sleeper"

同義詞：tierailroad tiecrosstie

a passenger car that has berths for sleeping

同義詞：sleeping carwagon-lit

pajamas with feet; worn by children

a piece of furniture that can be opened up into a bed

tropical fish that resembles a goby and rests quietly on the bottom in shallow water

同義詞：sleeper goby

an unexpected hit

"that movie was the sleeper of the summer"

Sleepers and workaholics: caching strategies in mobile environments
Sleepers and workaholics: caching strategies in mobile environments (extended version)
Who Are the Long Sleepers? Towards an Understanding of the Mortality Relationship
Trends in the prevalence of short sleepers in the USA: 1975-2006.
24-Hour metabolic rate in insomniacs and matched normal sleepers
Heart rate variability in insomniacs and matched normal sleepers.
PSYCHOLOGICAL AND PHYSIOLOGICAL DIFFERENCES BETWEEN GOOD AND POOR SLEEPERS.
Pre‐sleep cognitive activity: A comparison of sleep‐onset insomniacs and good sleepers
SF-36: evaluation of quality of life in severe and mild insomniacs compared with good sleepers.
Daytime alertness in relation to mood, performance, and nocturnal sleep in chronic insomniacs and noncomplaining sleepers.