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I recommend Sleepfaring by Prof Jim Horne.

http://www.amazon.com/Sleepfaring-Journey-through-Science-Sl...

Reading it can put you to sleep, but there's interesting stuff there. Some highlights, off the top of my head:

1) 'Coffee naps' are effective - i.e. if you're really tired and have to stay awake, drink a coffee quickly and nap for 15 minutes or so.

2) If you are sleep deprived, you only have to make up a fraction (I think it was something like 1/4) of the lost sleep - not the entire amount. It's easy to sleep too much.

3) If you can't sleep, instead of tossing and turning it might be better to simply get up and do a boring routine activity (e.g. puzzles), until you get tired again.

YMMV etc. - sleep is still not that well understood.