This is true, but quite simplified. I always recommend a great book by the pioneer of sleep science William C. Dement "The Promise Of Sleep" http://www.amazon.c

This is true, but quite simplified. I always recommend a great book by the pioneer of sleep science William C. Dement "The Promise Of Sleep" http://www.amazon.com/Promise-Sleep-Medicine-Connection-Happiness/dp/0440509017/ http://www.amazon.com/Promise-Sleep-Medicine-Connection-Happ... It explains this and many other aspects of sleep that you need to know to manage it effectively.