Might mean (unverified): Deep, uninterrupted sleep; very sound.
Definitions Related words Mentions
We found 2 dictionaries that define the word dead sleep:

General (2 matching dictionaries)
  1. dead sleep: Wiktionary
  2. Dead Sleep: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (dead sleep)

noun:  A particularly sound sleep
noun:  The first sleep of the night in a biphasic sleep pattern, before the watch.

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