Some animals get a lot less slumber — with certain species like the northern elephant seal taking sleeplessness to an extreme. | Reuters
asleep. But some animals get a lot less slumber — with certain species like the northern elephant seal taking sleeplessness to an extreme.
Researchers in a new study described the unusual sleep habits of this species, finding that during Pacific Ocean foraging journeys that can last seven months these bulky marine mammals sleep just two hours a day — cobbled together from naps of about 10 minutes each as they dive deep to avoid predators. The only other mammal known to get so little sleep is the African elephant.
The researchers placed on the heads of the seals a noninvasive waterproof synthetic rubber cap with sensors to monitor sleep signals generated by the brain, heart rate, location, and depth. The researchers focused on female seals because they engage in long open-ocean journeys while males feed in coastal waters.
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