Why all-night study session are a bad idea: brain builds memory while you sleep

As you sleep, your brain is actually forming new neural connections, helping you retain the things you learned during the day, according to a new study.

Article here.(via Instapundit)

I personally can count on one hand the number of times I "pulled an all-nighter" or close to it, to cram for an exam or finish working on a paper. I can't say that it helped, but I always thought it was better than nothing.