I gave this 5-minute lightning talk about sleep at Euruko 2012 in Amsterdam. In the presentation, I show the effects of sleep deprivation (no sleep) and sleep restriction (less sleep), which are important and often undervalued topics for developers and other professionals whose jobs depend on creative thinking (and for everyone else, too!). The presentation also touches on several other interesting sleep-related topics that I hope to expand on in a longer version.
My sources are listed on the last slide -- check them out (they're interesting). If you know any additional interesting books or articles on sleep, any anecdotes about changes to your sleeping schedule, or find any errors in my presentation, let me know! I'd love to hear your thoughts.