Search results
Results From The WOW.Com Content Network
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 ...
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 ...
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 ...
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 ...
One physiological characteristic of sleep goes by the name of "homeostatic regulation". This is the notion that animals need a more or less constant amount of sleep every day, so that if a subject is deprived of sleep one day, the amount of sleep tends to "rebound" (increase) the next few days. This has been observed in zebrafish. At night ...
Certain animal species, such as the ornate boxfish, have detailed markings. How do these intricate patterns materialize? A team of engineers may have an answer.
There have been several published lists of criteria for establishing whether non-human animals are capable of perceiving pain, e.g. [22] [36] Some criteria that may indicate the potential of another species, including cephalopods, to feel pain include: [36]