Can you actually learn a language while you sleep?

Related questions

1. How far is Berlin from Prague by train?
2. Can I drink the tap water in Prague?
3. Can Polish speakers understand Czech?
4. Does duolingo teach Czech?
5. Can you drink in public Prague?
6. Can you really learn a language with duolingo?
7. Is Prague a cheap place to visit?
8. What languages are similar to Russian?
9. How much should I tip in Prague?
10. Is Czech and Polish the same language?

Tags

1. #evidence
2. #listening
3. #students
4. #words
5. #possible
6. #language
7. #foreign
8. #listen
9. #recent
10. #linked
11. #improve
12. #which
13. #comes
14. #skills
15. #clearly
16. #vocabulary
17. #might
18. #sleep
19. #perhaps
20. #asked
21. #learning
22. #swiss
23. #study
24. #while