Usually means: Desire to rest, decreased alertness.
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We found 25 dictionaries that define the word sleepiness:

General (20 matching dictionaries)
  1. sleepiness: Merriam-Webster
  2. sleepiness: Oxford Learner's Dictionaries
  3. sleepiness: Collins English Dictionary
  4. sleepiness: Vocabulary.com
  5. Sleepiness, sleepiness: Wordnik
  6. sleepiness: Cambridge Advanced Learner's Dictionary
  7. sleepiness: Wiktionary
  8. sleepiness: Webster's New World College Dictionary, 4th Ed.
  9. sleepiness: Dictionary.com
  10. Sleepiness: Wikipedia, the Free Encyclopedia
  11. Sleepiness: Online Plain Text English Dictionary
  12. sleepiness: Webster's Revised Unabridged, 1913 Edition
  13. sleepiness: Rhymezone
  14. Sleepiness: AllWords.com Multi-Lingual Dictionary
  15. sleepiness: Webster's 1828 Dictionary
  16. sleepiness: FreeDictionary.org
  17. sleepiness: Mnemonic Dictionary
  18. sleepiness: TheFreeDictionary.com

Business (1 matching dictionary)
  1. sleepiness: Legal dictionary

Medicine (4 matching dictionaries)
  1. sleepiness: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. Sleep Terms (No longer online)
  4. sleepiness: Medical dictionary

(Note: See sleepy as well.)

Definitions from Wiktionary (sleepiness)

noun:  The property of being sleepy.

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