In 2023, researchers made plenty of discoveries for the record books — and the history books. This year’s scientific superlatives shed new light on our ancient ancestors, our planet and the animals we share it with.
Least sleep among mammals
However sleep-deprived you may be, you’re probably still better rested than a northern elephant seal. During monthslong hunting trips at sea, these seals nap less than 20 minutes at a time and average just two hours of total sleep per day. That rivals African elephants for the title of mammal that sleeps the least (SN: 4/20/23).
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