Sorry, no online dictionaries contain the exact phrase sleep progression.
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Reverse dictionary results:
1. stay
2. accelerate
3. advance
4. advances
5. advancing
6. change
7. changing
8. come
9. halfway house
10. last
11. level
12. moving
13. progress
14. stage
15. staged
16. staying
17. stays
18. stream
19. streamed
20. succession
21. suspend
22. take
23. accommodation
24. arise
25. chronotherapy
26. continue
27. continuing
28. dead
29. dormant
30. dreamed
31. dreaming
32. dreamt
33. fast
34. lie
35. lies
36. lir
37. litter
38. littering
39. rapid eye movement
40. rem

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You can look up the words in the phrase individually using these links:   sleep ?   progression ?
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