Unlike humans who can sleep through the night, dolphins must come up for air so their sleeping patterns are very different from ours. When dolphins sleep, they take turns resting one side of their brain at a time by closing the corresponding eye.
For example, the left eye closes when the right brain sleeps. Dolphins often sleep near the water’s surface, either floating still or swimming slowly. In shallow water, they might sleep on the ocean floor, rising to the surface regularly for air.
What Happens When a Dolphin Completely Loses Consciousness In Their Sleep?
A dolphin that fell into the kind of deep sleep we experience would simply stop coming up for air and drown. Keeping one half of the brain awake lets it carry on breathing and stay alert to anything dangerous nearby.
Why Do Dolphins Sleep With One Eye Open?
Dolphins sleep with just one eye open. They do this to stay aware of their surroundings and react quickly if needed. This also helps them detect predators, notice environmental changes, and come up for air when necessary.
Since just one half of the brain shuts down at a time, scientists call this pattern unihemispheric sleep. Dolphins share the trait with several other animals, including seals, crocodiles, and whales.
