Definitions:
a person or animal who is asleep or who sleeps in a specified way

a train carrying sleeping cars

a film, book, play, etc. that eventually achieves unexpected success after initially attracting very little attention

a ring or post worn in a pierced ear to keep the hole from closing.

a wooden or concrete beam laid transversely under railway track to support it.

a stocky fish with mottled coloration which occurs widely in warm seas and fresh water.