It's something you spend half your life doing, yet we still know very little about sleeping and dreaming, but in today's amazing top 50 countdown, we're giving you all the most incredible sleep facts to make you the ultimate sleep and dream expert. Like what happens if you stay awake for 72 hours, or if dogs really dream. And what's the deal with Lucid dreaming? Find out all the answers to your sleep questions right here!
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