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12:10 AM AniaSm
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Ptaki potrafią spać z jednym okiem otwartym, co im umożliwia zachować czujność wzrokową. To zjawisko nazywane jest jednopółkulowym snem wolnofalowym."
"Birds can sleep with one eye open, which allows them to maintain visual alertness. This phenomenon is called unihemispheric slow-wave sleep."
Abstract:
... sleep is a periodically necessary behaviour and therefore, in the majority of animals, it involves the whole brain and body. However, certain marine mammals and species of birds show a different sleep behaviour, in which one cerebral hemisphere sleeps while the other is awake. ... In birds, antipredation vigilance is the main function of unihemispheric sleep ...
... Compared to bihemispheric sleep, unihemispheric sleep would mean a reduction of the time spent sleeping and of the associated recovery processes. However, the behavior and health of aquatic mammals and birds does not seem at all impaired by the reduction of sleep. ... For cetaceans, unihemispheric sleep is the only way to sleep, while in seals and birds, unihemispheric sleep events are intermingled with bihemispheric and rapid eye movement sleep events. ...
Conclusion:
..... Sleep and wakefulness are opposite brain and body conditions that accomplish different but complementary functions. Sleep is a vulnerable state of almost-complete disconnection from environmental events aimed at a mandatory brain and body recovery, while wakefulness is characterised by intense and necessary interaction with the environment aimed at survival. In some animals, this conflict has been mitigated by adopting a behavioural strategy in which they attempt to survive and recover at the same time. In other terms, they sleep with half of the brain while remaining awake with the other half. ...
VIDEO
https://pmc.ncbi.nlm.nih.gov/articles/i ... -221-s.avi
source: Mascetti G. G. (2016). Unihemispheric sleep and asymmetrical sleep: behavioral, neurophysiological, and functional perspectives.
Nature and science of sleep, 8, 221–238.
https://doi.org/10.2147/NSS.S71970
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