The mob life is tough. You're always watching your back, you never know who to trust, and you're always watching your back. But while precaution and paranoia are skills that mafiosos have to learn, one animal was born ready and can literally sleep with one eye open. Which animal has mastered the art of being constantly on guard?
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Correct Answer: Dolphins
Dolphins take "sleeping with one eye open" from paranoid metaphor to straight-up reality by shutting down only half their brain at a time. These aquatic overachievers basically mastered the power nap and are able to keep one half of their brain on lifeguard duty while the other half catches some z's. Trust a dolphin to figure out how to sleep and still never miss a thing happening at the underwater social club.
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