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Many species of birds and marine mammals have advantages due to their unihemispheric slow-wave sleep capability, including, but not limited to, increased ability to evade potential predators and the ability to sleep during migration. Unihemispheric sleep allows visual vigilance of the environment, preservation of movement, and in cetaceans ...
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 ...
The only common observation is that reptiles do not have REM sleep. [7] Sleep in some invertebrates has also been extensively studied, e.g., sleep in fruitflies (Drosophila) [40] and honeybees. [41] Some of the mechanisms of sleep in these animals have been discovered while others remain quite obscure.
Slow-wave sleep is necessary for survival. Some animals, such as dolphins and birds, have the ability to sleep with only one hemisphere of the brain, leaving the other hemisphere awake to carry out normal functions and to remain alert. This kind of sleep is called unihemispheric slow-wave sleep, and is also partially observable in human beings ...
Atrophy of the hippocampus has been observed during depression, consistent with animal models of stress and neurogenesis. [116] [117] Stress can cause depression and depression-like symptoms through monoaminergic changes in several key brain regions as well as suppression in hippocampal neurogenesis. [118]
Social hierarchy, diet, brain size and body mass are contributing factors to how much sleep particular animals naturally need. Outside factors might even i Research Shows that Animals, too, Need a ...
Changes in sleep patterns in depression are very close to those seen in acutely stressed animals; these changes can be used as a predictor for developing depression. Once again, studies have shown a bidirectional nature between depressive symptoms and lack of sleep due to stress.
Reducing stress: Stress can trigger fight-or-flight, increasing stress hormones like adrenaline and cortisol. Too much cortisol can suppress the immune system and cause an inflammatory response in ...