Do Dolphins Sleep with One Eye Open?

Answer

Dolphins normally sleep only with half of their brain at a time. This is due to the fact that dolphins are conscious breathers, if they sleep and go unconscious, they would simply suffocate or drown. This is why sleeping dolphins are seen as resting, floating with one eye open at the surface.
Q&A Related to "Do Dolphins Sleep with One Eye Open"
Dolphins keep one eye open when they sleep so that if their enemies come to eat them they see them coming and can react and get themselves out of danger.
http://wiki.answers.com/Q/Why_do_dolphins_keep_one...
Dolphins sleep with one eye open & with one half of their brain turned off so they can breath!
http://www.kgbanswers.com/why-do-dolphins-sleep-wi...
You can't really sleep with your eyes open by choice. Although there are some people that seem to have their eyes open when they are sleeping, they don't know they do, and are not
http://www.ask.com/web-answers/Health/Diseases/how...
Dolphins have a unique ability to use their eyes independently. It happens because their brains are separated into two different rooms, which allows them to rest one eye and them
http://answers.yahoo.com/question/index?qid=200810...
1 Additional Answer
Ask.com Answer for: do dolphins sleep with one eye open
Dolphins sleep with only one hemisphere of their brains in a resting state. This allows them to maintain enough conciousness to breathe and watch for possible threats.
In captivity, dolphins enter a full sleep state. A tail kick reflex keeps their blowholes above water, allowing them to breathe.
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