Can you retain information while sleeping?

Related questions

1. Does duolingo tell you how fluent you are?
2. How successful is duolingo?
3. Is the duolingo owl a boy or a girl?
4. Is Rosetta Stone better than duolingo?
5. Can you become fluent in French with duolingo?
6. What is duolingo meme?
7. What is duolingo English test?
8. Can duolingo work offline?
9. How good can you get with duolingo?
10. Is there Arabic in duolingo?

Tags

1. #words
2. #learn
3. #these
4. #sleep
5. #foreign
6. #language
7. #highly
8. #vocabulary
9. #learning
10. #researchers
11. #again
12. #zurich
13. #things
14. #fribourg
15. #already
16. #nevertheless
17. #university
18. #while
19. #effective
20. #shown
21. #played