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Published 12:52 10 Mar 2022 GMT
"Not only do sleeping sharks have reduced responsiveness to stimulation, they also have lower metabolic rate," Dr Kelly and his team write in the study.
The sharks sometimes slept with their eyes shut, but this was concluded to be a result of the light levels as opposed to how deep their sleep was as it happened most often during the day. The study concludes: "Future research should focus on other physiological indicators of sleep, such as changes in brain activity, for a more complete portrait of sleep in these vertebrates." The findings aren't just significant for the shark world though, as they may help explain the wider mystery around why it is animals and humans need to sleep, the New Daily reports. Dr Kelly explained: "We still haven’t gotten our heads around why the hell it is that we spend one-third of our lives in this weird state, where we are just kind of dead, kind of unconscious.New details emerge as ‘missing’ GoPro warn by model during fatal bungee jump was ‘hidden’ after death
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