super sleeper

Noun

super-sleeper (plural super-sleepers)

1. One who is particularly good at falling asleep.
   • Supersleepers are the undisputed stars of Babyville. They're the invants who fall asleep happily, independently, consistently.2009, Paige Hobey, Allison Nied, The Working Gal's Guide to Babyville
2. An extremely efficient sleeper who does not require much sleep.
   • Some supersleepers have even been studied . These people normally sleep only three or four hours a night , but their EEG records show that they are able to get much more deep sleep and REM sleep into their short sleeping periods than would normally be expected.1974, Alvin Silverstein, Virginia B. Silverstein, Sleep and Dreams, page 130
3. A luxury vehicle that allows passengers to sleep.
   • If anyone knows what traveling in luxury is all about in the LEGO world, it’s this guy. LuxuryBricks is back with another custom creation, a super sleeper semi-truck that is just packed with amenities your mini-figs are going to love.2022 August 13, Cristina Mircea, “Freightliner Argosy-Inspired LEGO Super Sleeper Semi-Truck Is Packed With Amenities”, in Autoevolution
4. A high-performance car that has an unassuming appearance.
   • One of the supersleepers. Its slant-six engine made the Ark look flimsy; it would almost literally run forever, and Dodge pick-ups with the same engine have gone 160,000 miles with no teardown.1977, Robert Wieder, George Hall, The Great American Convertible, page 95
5. Someone or something that does not seem very impressive at first but that goes on to become a star.
   • I was fairly impressed with their position breakdowns -- included are "rising," "falling", "underrated,: "sleeper," "super sleeper,” “risky business," and "value play” candidates at each spot on the diamond as well as the "best power" and "best base stealer” at each offensive slot.2005, Chris Lee, The Winner's Guide to Fantasy Baseball, page 5