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Sleeping under the risk of predation
Every studied animal engages in sleep, and many animals spend much of their lives in this vulnerable behavioural state. We believe that an explicit description of this vulnerability will provide manyExpand
Behavioral, neurophysiological and evolutionary perspectives on unihemispheric sleep
Several animals mitigate the fundamental conflict between sleep and wakefulness by engaging in unihemispheric sleep, a unique state during which one cerebral hemisphere sleeps while the other remainsExpand
A Phylogenetic Analysis of Sleep Architecture in Mammals: The Integration of Anatomy, Physiology, and Ecology
Among mammalian species, the time spent in the two main “architectural” states of sleep—slow‐wave sleep (SWS) and rapid‐eye‐movement (REM) sleep—varies greatly. Previous comparative studies of sleepExpand
A Synthesis of Sleep in Wild Birds
In this synthesis we have attempted to survey and reanalyse the current literature concerning bird sleep. This was achieved by first reviewing present theory describing functions of sleep. TwoExpand
Phylogenetics and the correlates of mammalian sleep: a reappraisal.
The correlates of mammalian sleep have been investigated previously in at least eight comparative studies in an effort to illuminate the functions of sleep. However, all of these univariate analysesExpand
Facultative control of avian unihemispheric sleep under the risk of predation
Birds and aquatic mammals are the only taxonomic groups known to exhibit unihemispheric slow-wave sleep (USWS). In aquatic mammals, USWS permits sleep and breathing to occur concurrently in water.Expand
Half-awake to the risk of predation
Birds have overcome the problem of sleeping in risky situations by developing the ability to sleep with one eye open and one hemisphere of the brain awake. Such unihemispheric slow-wave sleep is inExpand
Unilateral Eye Closure and Interhemispheric EEG Asymmetry during Sleep in the Pigeon (Columba livia)
Aquatic mammals (i.e., Cetaceans, eared seals and manatees) and birds show interhemispheric asymmetries (IA) in slow-wave sleep-related electroencephalographic (EEG) activity, suggesting that theExpand
History and future of comparative analyses in sleep research
The comparative methods of evolutionary biology are a useful tool for investigating the functions of sleep. These techniques can help determine whether experimental results, derived from a single orExpand