Swiss psychologists have found that listening to new languages when asleep can actually help to reinforce learning.
The team from the Swiss National Science Foundation (SNSF) who were writing for the journal Cerebal Cortex, carried out the experiment on sixty German-speaking student volunteers. The students were gathered together at 10pm in order to learn a selection of Dutch words for the first time. Whilst half of the students went to sleep under lab conditions, the other half were instructed to stay awake. Both groups then had the Dutch words played back to them.