Still, if late sleepers want to lose a few pounds, they can go to bed earlier than they usually do, thereby reducing their chances of taking snacks before bedtime.
2017年12月六级真题（第二套）听力 Section B
柯林斯高阶英汉双解学习词典释义
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睡觉…者;睡眠…的人
You can use sleeper to indicate how well someone sleeps. For example, if someone is a light sleeper, they are easily woken up.
(英国英语的)卧铺车厢,卧铺铺位（在美国英语中，sleeping car 指卧铺车厢，roomette 则指一个卧铺的铺位)
In British English, a sleeper is a carriage on a train containing beds for passengers to sleep in at night, or a section of such a carriage. The usual American words are sleeping car for the carriage and roomette for the section.
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卧铺列车
A sleeper is a train with beds for its passengers to sleep in at night.
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(铁路上的)枕木
Railway sleepers are large heavy beams that support the rails of a railway track.
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出乎意料的成功者;爆冷门的人(或事物)
If you describe someone or something as a sleeper, you mean that they unexpectedly become successful, often after a long period of being inactive or unknown.