For an activity so common, sleeping is still one of biology's biggest mysteries. Dr. Matthew Walker, Ph.D. has devoted his career to uncovering exactly why we sleep and how understanding sleep can change our lives for the better.

His first book, Why We Sleep, highlights his last two decades of scientific research and experiments on sleep. The book proves that sleep is a powerful tool to achieving an all-around healthier life.

Click here to snag your copy of Why We Sleep: Unlocking the Power of Sleep and Dreams.