sleeper
[ˈslipɚ]
n.
卧车;
轨枕;
睡觉（呈某种状态）的人;
冬眠动物;
例句:
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She was usually a light sleeper.
她通常很容易惊醒。
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I usually go up to London on the sleeper.
我一般都乘卧车去伦敦.
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Please don't make any noise — my mother's a very light sleeper.
请安静——我母亲睡觉很轻.
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It's the most unlikely sleeper hit of the summer.
来自THETIMES
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Then they were planted in this country as sleeper agents.
来自NEWYORKER
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He isn't a good sleeper at the best of times.
来自NEWYORKER