New experiments suggest sharks sleep to save energy between meals, and could lead to a clearer model of how sleep evolved and developed among vertebrate animals.
Sharks benefit from some shuteye, and biologists in Australia and New Zealand think they’ve begun to understand why. Their experiments suggest sharks sleep to save energy between meals. The discovery might lead to a clearer model of how sleep evolved and developed among vertebrate animals.
moving considerably less and reacting more slowly to mild electrical shocks delivered through the water. Not surprisingly, the sharks metabolized oxygen fastest while actively swimming. The rate dropped when they stopped swimming, and it dropped even further during behavioral signs of sleep—which the researchers defined as remaining motionless for at least 5 minutes with the body held in a near-horizontal position. On average, theThe findings close the case on sleep in sharks, Kelly says.
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