Sorry, no online dictionaries contain the exact phrase prolonged sleep.
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Reverse dictionary results:
1. coma
2. narcotherapy
3. insomnia
4. dormition
5. lethargy
6. continue
7. continues
8. continuing
9. siren
10. comatose
11. resting
12. haggard
13. narcotic
14. bedsore
15. boom
16. far
17. long
18. long-term
19. macrophobia
20. mydriasis
21. natter
22. palaver
23. pause
24. reach
25. reaches
26. reaching
27. resident
28. roll
29. screed
30. stretch
31. stretched
32. traction
33. affluent
34. age
35. bau
36. bay
37. baying
38. din
39. extended
40. eyestrain

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You can look up the words in the phrase individually using these links:   prolonged ?   sleep ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
prol*to search for words beginning with prol, or
*leepto search for words ending with leep
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