Birds sleep with half brain off and rest on
Your support helps us to tell the story
From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or producing our latest documentary, 'The A Word', which shines a light on the American women fighting for reproductive rights, we know how important it is to parse out the facts from the messaging.
At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.
The Independent is trusted by Americans across the entire political spectrum. And unlike many other quality news outlets, we choose not to lock Americans out of our reporting and analysis with paywalls. We believe quality journalism should be available to everyone, paid for by those who can afford it.
Your support makes all the difference.BIRDS CAN catch 40 winks without being caught by a predator because they can, literally, stay half asleep with one eye open and the other closed, scientists have discovered.
A study of the unusual sleeping patterns of mallard ducks promises to help scientists to understand rare sleep disorders in humans.
Biologists at Indiana State University, led by Niels Rattenborg, say that birds can sleep with both eyes closed and their whole brain asleep, or they can rest half their brain by keeping one eye shut. "Birds have overcome the problem of sleeping in risky situations by developing the ability to sleep with one eye open and one hemisphere of the brain awake," the scientists report in the journal Nature.
Keeping one half of the brain at rest, called unihemispheric slow-wave sleep, is in direct contrast to the typical situation where sleep and wakefulness are mutually exclusive states of the whole brain, the scientists say. "We have found that birds can detect approaching predators during unihemispheric slow-wave sleep, and that they can increase the use of unihemispheric sleep as the risk of predation increases," they report.
"We believe this is the first evidence for an animal behaviourally controlling sleep and wakefulness simultaneously in different regions of the brain."
The scientists studied groups of mallard ducks while they rested side by side and found that those at the edge of the group were significantly more likely to keep one eye open, with the closed eye being on the side of its nearest neighbour.
"We have found that birds sleeping under risky situations spend more time with one eye open and half the brain awake, and choose to direct the open eye towards a perceived threat," added Dr Rattenborg.
The findings have important implications for sleeping patterns in humans, he said. "For example, the feeling of sleepiness and impaired performance experienced after losing sleep may occur because parts of the brain are falling asleep, while the other parts are staying awake.
"Furthermore, certain sleep disorders, such as sleep walking, are thought to occur when parts of the brain awaken while other parts remain asleep."
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies
Comments