Do fish sleep?

Do Marine Mammals sleep underwater? Do Fish have eyelids? Do some Sea Creatures keep swimming while they sleep? Grown-Ups: Be a better you in 2024 with Babbel, the science-backed language-learning app that actually works. Get 55% off at Babbel.com/SMARTED. Rules and restrictions may apply. Say hello to HelloFresh! Go to HelloFresh.com/smartedfree and use code: smartedfree for FREE breakfast for life! One breakfast item per box while subscription is active.  Have you started your FREE TRIAL of Who Smarted?+ for AD FREE listening, an EXTRA episode every week & bonus content? Sign up right in the Apple app, or directly at WhoSmarted.com and find out why more than 1,000 families are LOVING their subscription! Get official Who Smarted? Merch: tee-shirts, mugs, hoodies and more, at Who Smarted? Calling all smarty pants, especially parents and teachers, we want your feedback!