dead sleep

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dead sleep (usually uncountable, plural dead sleeps)

  1. The first sleep of the night in a biphasic sleep pattern.
    • 2001, A. Roger Ekirch, Sleep We Have Lost: Pre-Industrial Slumber in the British Isles, The American Historical Review, Volume 106, Number 2 (April 2001), American Historical Association, page 364:
      Until the close of the early modern era, Western Europeans on most evenings experienced two major intervals of sleep bridged by up to an hour or more of quiet wakefulness. [] The initial interval of slumber was usually referred to as “first sleep,” or, less often, “first nap” or “dead sleep.”