Proof you can learn while you sleep
A new study shows you can learn while you sleep. Researchers found that sleeping participants who heard a tone followed by an odor would either sniff (if they had eventually learned to associate that tone with a good odor) or cut their breath short (if they had eventually learned to associate that tone with a bad odor). The next day, the (awake) participants continued the behavior, even though none of them remembered anything from the night before.
http://www.medicalnewstoday.com/articles/249505.php