animals
Nodding off is dangerous. Some animals have evolved extreme ways to sleep in precarious environments
- While flying, frigatebirds can sleep with one half of the brain at a time. The other half remains semialert so that one eye is still watching for obstacles in their flight path
- Dolphins can sleep with one half of the brain at a time while swimming. Some other birds, including swifts and albatrosses, can sleep in flight
- Elephant seals sleep during the deepest portions of their dives, when they were below the depths that predators usually patrol
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