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Monday, May 3, 2010

Dolphins have exclusive way to use their eyes independently. It happens because their brains are separated into two different ways, which allow their one eye to rest while the other is open to watch for danger for the possible attack of predators such as sharks. One reason why they want to sleep is to acquire energy. At times they sleep with both eyes close and that is about 20% of the time.

How do they sleep?

Based from the study of Williams et al, 1990, dolphins are conscious with their breath. This mean they cannot appear to have a full deep sleep, because they would probably suffocate. So they need to get into the surface to breath. This has been determined by EEG examination, they sleep about 8 hours a day. Recent research confirmed that dolphins have only one eye closed when sleeping and remain constant for an hour, after which it switches with the other eye again.

Rapid Eye Movement (REM) usually associated by dreaming is only a rare case. Some scientist claims that dolphins do not have REM sleep at all.

A dolphin’s behavior like resting and sleeping depends on the condition and possibly of character preferences. They can swim slowly and surface every now and then for a breath, they can rest at the surface with their blowhole exposed, or on the bottom (in shallow water) and rise into the surface every so often to catch up breath.

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