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Whales often rest for periods of time under the surface in order to sleep in mainly horizontal positions, although sperm whales also rest vertically. [42] However, as they consciously need to breathe at the surface, they can rest only one-half of their brain at a time, known as unihemispheric slow-wave sleep.
For some time researchers have been aware that pods of sperm whales may sleep for short periods, assuming a vertical position with their heads just below or at the surface, or head down. [114] A 2008 study published in Current Biology recorded evidence that whales may sleep with both sides of the brain. It appears that some whales may fall into ...
A 2008 study found that sperm whales sleep in vertical postures just under the surface in passive shallow 'drift-dives', generally during the day, during which whales do not respond to passing vessels unless they are in contact, leading to the suggestion that whales possibly sleep during such dives. [56]
Just this month some 200 pilot whales stranded themselves on. There's a tiny tip of sand at the very northern tip of New Zealand's southern island called Farewell Spit. It is lovely and remote.
A 2008 study found that sperm whales sleep in vertical postures just under the surface in passive shallow "drift-dives", generally during the day, during which whales do not respond to passing vessels unless they are in contact, leading to the suggestion that whales possibly sleep during such dives. [71]
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Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...