Sorry, no online dictionaries contain the exact phrase signs of lack of sleep.
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Reverse dictionary results:
1. fatigue
2. drowsiness
3. lethargy
4. exhaustion
5. somnolence
6. heaviness
7. tired
8. asleep
9. dozy
10. drowsy
11. lipothymy
12. lullaby
13. obdormition
14. oscitant
15. pandiculation
16. sleepy
17. sloom
18. slumber
19. sound asleep
20. beauty sleep
21. comatose
22. deliquium
23. drowse
24. fall asleep
25. fast asleep
26. groggy
27. jet-lagged
28. lull
29. nappy
30. nodder
31. oversleep
32. sleep
33. sleep like a log
34. sleepe
35. sleepfulness
36. sleepies
37. sleepytime
38. snoozer
39. sound

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You can look up the words in the phrase individually using these links:   signs ?   of ?   lack ?   of ?   sleep ?
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