You toss, you turn. You wake up in the middle of the night. You've tried going to bed early. You've tried staying up late hoping you'll eventually crash. But seriously, why can't you just fall asleep? James Maas, the best-selling author of PowerSleep and acclaimed former Cornell professor (he also coined the term "power nap") knows why. "Americans don't value sleep," says Maas. "Seventy percent are sleep deprived, but most don't realize it and are working zombies." Here's a cheat sheet on how you can get the ideal amount of sleep -- and the very real consequences if you don't.