Saturday, 23 February 2013

How Seals Sleep With Half A Brain

by LiveScience Staff
Date: 20 February 2013 Time: 06:14 PM ET

When a seal goes to sleep in the water, it shuts down just half of its brain at a time, much like a snoozing whale or dolphin. Now researchers say they know more about the chemicals behind the amazing ability.

"Seals sleep this way while they're in water, but they sleep like humans while on land. Our research may explain how this unique biological phenomenon happens," University of Toronto researcher John Peever said.

In experiments, Peever's colleague, doctoral student Jennifer Lapierre, measured levels of different brain chemicals in fur seals when they were awake and asleep.

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