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Slumbering between sky and Earth | Max-Planck-Gesellschaft

https://www.mpg.de/10783234/frigatebirds-sleep-midflight

In humans, even a very short attack of drowsiness while driving can have fatal consequences. Frigatebirds, on the other hand, have no problems snoozing while they cruise through the air. What’s more, they generally get by on very little sleep during their long flights over the open sea, which can last for days. A team of scientists headed by Niels Rattenborg from the Max Planck Institute for Ornithology in Seewiesen has demonstrated, for the first time that birds can fly in sleep mode.
Whether roundworms, fruit flies, fish or elephants