Find out everything there is to know about Alzheimer's disease and stay updated on the latest news in memory loss with the comprehensive articles, interactive features and pictures at LiveScience.com. Learn more about this disease as scientists continue to make amazing discoveries about memory.
Sleep will consume one-third of your life. You can't avoid it, nor should you. Sound slumber is energizing and uplifting. But there's more to it. Sleep is also essential for effective learning.