sleep (is for the smart)

["Psychologists and neuroscientists dispute the precise role of the hippocampus, but, in general, agree that it has an essential role in the formation of new memories about experienced events. Some researchers prefer to consider the hippocampus as part of a larger medial temporal lobe memory system responsible for general declarative memory (memories that can be explicitly verbalized — these would include, for example, memory for facts in addition to episodic memory)."]

A recent Princeton University study has found that no sleep does in fact mean no new brain cells. This research team discovered that sleep deprived animals had high levels of stress hormone, which directly reduces cell production and connection formation within the hippocampus. (This is no good. You want to keep that savings account in good order.)

So be smart, kids: stay in school AND get plenty of sleep so that you can retain what you learn!