Etymology

sleeper

sleep·er
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Today it means: Someone who sleeps. Full definition →

Middle English sleper
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sleeper · noun, verb1

  1. Middle English · inherited fromsleper
  2. English todaysleeper

From Middle English sleper, equivalent to sleep + -er.

sleeper · noun2

Compare Norwegian sleip (“a sleeper (a timber); as adjective, slippery, smooth”). See slape.

Etymology from Wiktionary, CC BY-SA 4.0.