★ During the sleeping cycle, one brain hemisphere remains active, while the other hemisphere shuts down.
★ The active hemisphere handles surfacing and breathing behaviour.
★ The daily sleeping cycle lasts for about 8 hours(1/3 per day).
★ During the sleeping cycle, they remain near the surface, swimming slowly or "logging", and occasionally closing one eye.
★ When left hemisphere is active, right eye is open and when right hemisphere is active, left eye is open as hemispheres control opposite organs.
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★ When left hemisphere is active, right eye is open and when right hemisphere is active, left eye is open as hemispheres control opposite organs.
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