Have you ever heard that the most widely used drug in the world is caffeine? Has it ever crossed your mind that putting a pillow under your knees is much healthier than putting it under your head? And could you ever guess that every third American has symptoms of insomnia? We bet it's totally new info for you, and there's much more hidden, but absolutely incredible facts about sleep - for example, how you can fall asleep quickly. And at least this question we can clear out without much waiting - here it is!