Interesting Fact - Memory
According to research carried out at Saarland University in Germany, a short nap at the office or in school significantly improves recall, they found that a nap 'produces a five-fold improvement in information retrieval from memory'.
(Participants in the study learned 90 single words and 120 unconnected word pairs. Some students then watched a DVD while others slept. When they were then retested, those who had slept remembered more word pairs.
I'm just going to close my eyes for a few minutes now.)