Sleep is an essential and fascinating part of our lives, full of surprising facts. Did you know you spend about a third of your life sleeping, or that your brain is highly active during sleep, consolidating memories and solving problems? Everyone dreams, even if they don’t remember, and blind individuals often experience dreams centered on sound and touch. Animals also have quirky sleep habits—dolphins sleep with one eye open, and giraffes sleep only 30 minutes a day! Interestingly, sleep deprivation for 17 hours can impair your body like a mild alcohol buzz, and your preferred sleep position might reveal personality traits. Sleep truly is a marvel, combining mystery, biology, and universality.