We found 28 dictionaries that define the word sleepless:

General (25 matching dictionaries)

1. sleepless: Longman Dictionary of Contemporary English
2. sleepless: Merriam-Webster
3. sleepless: Oxford Learner's Dictionaries
4. sleepless: American Heritage Dictionary of the English Language
5. sleepless: Collins English Dictionary
6. sleepless: Vocabulary.com
7. Sleepless, sleepless: Wordnik
8. sleepless: Cambridge Advanced Learner's Dictionary
9. sleepless: Wiktionary
10. sleepless: Webster's New World College Dictionary, 4th Ed.
11. sleepless: The Wordsmyth English Dictionary-Thesaurus
12. sleepless: Infoplease Dictionary
13. sleepless: Dictionary.com
14. sleepless: Cambridge Essential American English Dictionary
15. Sleepless (Adept album), Sleepless (Cazzette song), Sleepless (Eric Saade song), Sleepless (Flume song), Sleepless (Jacksoul album), Sleepless (Kate Rusby album), Sleepless (King Crimson song), Sleepless (Peter Wolf album), Sleepless (The X-Files), Sleepless (comics), Sleepless (disambiguation), Sleepless (novel), Sleepless: Wikipedia, the Free Encyclopedia
16. Sleepless: Online Plain Text English Dictionary
17. sleepless: Webster's Revised Unabridged, 1913 Edition
18. sleepless: Rhymezone
19. sleepless: AllWords.com Multi-Lingual Dictionary
20. sleepless: Webster's 1828 Dictionary
21. sleepless: FreeDictionary.org
22. sleepless: Mnemonic Dictionary
23. sleepless: TheFreeDictionary.com

Business (1 matching dictionary)

24. sleepless: Legal dictionary

Computing (1 matching dictionary)

25. sleepless: Encyclopedia

Medicine (1 matching dictionary)

26. sleepless: Merriam-Webster Medical Dictionary

(Note: See sleeplessly as well.)

Definitions from Wiktionary ( ) ▸ adjective:  Characterized by an absence of sleep: wakeful. Similar: awake, insomniac, watchful, alert, lidless, slumberless, restless, insomnious, wakeful, insomnolent, more... Opposite: rested, asleep, slumbering, peaceful, calm Types: insomnia, restless, trouble sleeping, disrupted sleep, awake, more... Phrases: sleepless night, sleepless person, Sleepless in Seattle, Sleepless in Peckham, All These Sleepless Nights, more... Adjectives: long, withal, first, romantic, other, several ▸ Words similar to sleepless ▸ Usage examples for sleepless ▸ Idioms related to sleepless ▸ Wikipedia articles (New!) ▸ Popular nouns described by sleepless ▸ Words that often appear near sleepless ▸ Rhymes of sleepless ▸ Invented words related to sleepless