Sorry, no online dictionaries contain the exact phrase opposite of opposite of sleepless.

Reverse dictionary results:
1. insomniac
2. restless
3. pea
4. black
5. down
6. foe
7. fronting
8. negative
9. opposed
10. tan
11. colored
12. marjoram
13. omdurman
14. privet
15. yolk
16. abuse
17. alb
18. almond
19. asperse
20. aware
21. bald
22. bald-faced
23. balding
24. beige
25. blanc
26. blaze
27. blazed
28. boletus pallidus
29. bone
30. bones
31. cacophonous
32. camphor
33. candescent
34. cantankerous
35. cerused
36. chambray
37. clerical collar
38. color
39. colour
40. corpus striatum

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   opposite ?   of ?   sleepless ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
oppo*to search for words beginning with oppo, or
*lessto search for words ending with less
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