sleeper
//ˈsliːpər//
Noun
sleeperSingular
sleepersPlural
1
A person who is asleep or who sleeps in a specified way.
My brother is a light sleeper, so any noise wakes him up.
2
A thing that achieves unexpected success after initially attracting little attention.
The low-budget film turned out to be a sleeper hit of the year.
3
A wooden or concrete beam laid transversely under railway track to support it.
The old wooden sleepers were replaced with concrete ones.
4
A sleeping car on a train.
We booked a sleeper for the overnight journey to Paris.
5
A one-piece garment for an infant or small child, covering the entire body including the feet.
The baby looked so cozy in her new fleece sleeper.