A number of cells were bidirectional, in that they did not a have a peak firing rate in a preferred direction that was at least doubled that in the opposite direction, raising the possibility that apparently reverse replay events merely reflected forward replay of neurons in the opposite direction.
Foster & Wilson Nature (06) 440:680-683
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The purpose of dreaming is learning. While you are sleeping, your brain is digesting the day, deciding which new experiences to consolidate into long-term memory.
Non Sequitur replays the evolutionary tape with interesting results...
[Hat-Tip to Michael]
M. Yglesias seems to be dissing Rihanna's "Umbrella." Well, I'll raise him "Pon de Replay"....
summarized less concisely
http://www.gnxp.com/blog/2006/05/now-where-was-i.php