Sleep research shows that some marine mammals have the ability to rest half of their brain at a time, skipping a key sleep stage we see in humans.
This method, which differs significantly from how humans sleep, hinges on the varied sleep stages exhibited in cetaceans and us. “Sleep in most land mammals consists of two stages, slow-wave sleep and REM [rapid eye movement] sleep,” says Lyamin. “Cetaceans appear to display only one sleep stage, which is slow-wave sleep.”sleep in humans, it’s startling that cetaceans don’t seem to do it at all.
Because REM sleep is characterized by eye movement, ocular motion can be measured using an electrooculogram . Muscle movement, which can determine if an animal is asleep, can similarly be measured using an electromyogram . With the recent advent of dataloggers, revisiting research with wild animals may soon prove fruitful.Beyond dolphins and whales, some research has also probed how sleep works in mammals that split their time between land and sea, such as seals.
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