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Facultative control of avian unihemispheric sleep under the risk of predation
Ostriches Sleep like Platypuses
TLDR
The findings reveal a recurring sequence of steps in the evolution of sleep in which SWS and REM sleep arose from a single heterogeneous state that became temporally segregated into two distinct states, and suggest that forebrain activation during REM sleep is an evolutionarily new feature, presumably involved in performing new sleep functions not found in more basal animals.
Local sleep homeostasis in the avian brain: convergence of sleep function in mammals and birds?
TLDR
After staying awake watching David Attenborough's The Life of Birds with only one eye, SWA and the slope of slow waves increased only in the hyperpallium—a primary visual processing region—neurologically connected to the stimulated eye, providing the first electrophysiological evidence for local sleep homeostasis in the avian brain.
Evidence that birds sleep in mid-flight
TLDR
It is established that birds can sleep in flight, and the results challenge the view that they sustain prolonged flights by obtaining normal amounts of sleep on the wing.
Migratory Sleeplessness in the White-Crowned Sparrow (Zonotrichia leucophrys gambelii)
TLDR
Songbirds exhibit an unprecedented capacity to reduce sleep during migration for long periods of time without associated deficits in cognitive function, in direct contrast to the decline in accuracy and responding observed following as little as one night of experimenter-induced sleep restriction in the same birds during the nonmigratory season.
Half-awake to the risk of predation
TLDR
It is found that birds can detect approaching predators during unihemispheric slow-wave sleep, and that they can increase their use of uni Hemispheric sleep as the risk of predation increases.
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