Ahhh, just in time for the holidays, here is another study detailing all the different reasons we should sleep more.   They gave some students a language test with sleep and without, and the nappers performed better.  They also sleep deprived some rats, and even after they had two weeks of catchup sleep, they were outperformed by regularly rested rats.  So I should take a nap every day, that way I can learn Chinese and find some cheese of my own.