Gina Johnson
Sleep is a biological requirement for almost all animals, from jellyfish to humans. Sleep is an essential and complex biological process that needs to be satisfied to maintain many physiological functions, such as muscle recovery and repair, neurological development, cardiac, immune, and metabolic functions, cognition, and mood. Sleep patterns vary widely among species, with some foregoing sleep for extended periods and some engaging in unihemispheric sleep, in which one brain hemisphere sleeps while the other remains awake. This raises the question: what is the need for sleep among complex organisms?
| Characteristics | Values |
|---|---|
| Sleep is a biological requirement | Sleep is a biological requirement for all animals except for basal species with no brain or only a rudimentary brain |
| Sleep is necessary for changes in the neural system | Raizen et al.'s results suggest that sleep is necessary for changes in the neural system |
| Sleep is important for physiological functions | Sleep is important for muscle recovery and repair, neurological development, cardiac, immune, and metabolic functions, cognition, and mood |
| Sleep is important for health | Inadequate sleep is associated with obesity, metabolic, immunological, and cardiovascular health, some types of cancer, pain, and mental illness |
| Sleep is important for survival | Findings show that if rats do not get sleep, they die in a few weeks |
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What You'll Learn
- Sleep is a biological requirement for all animals except for basal species with no brain or only a rudimentary brain
- Sleep patterns vary widely among species, with some foregoing sleep for extended periods and some engaging in unihemispheric sleep
- Sleep is necessary for changes in the neural system
- Sleep is an essential and complex biological process that needs to be satisfied to maintain many physiological functions
- Inadequate sleep is a threat to health because of the association of insufficient sleep with obesity, metabolic, immunological, and cardiovascular health, some types of cancer, pain, and mental illness
Sleep is a biological requirement for all animals except for basal species with no brain or only a rudimentary brain
Sleep is an essential and complex biological process that needs to be satisfied to maintain many physiological functions, such as muscle recovery and repair, neurological development, cardiac, immune, and metabolic functions, cognition, and mood. Inadequate sleep is a threat to health because of its association with obesity, metabolic, immunological, and cardiovascular health, some types of cancer, pain, and mental illness.
Sleep has been observed in mammals, birds, reptiles, amphibians, fish, and, in some form, in insects. Bees have some of the most complex sleep states amongst insects. Sleep states have also been observed in jellyfish, which do not have a brain or central nervous system, and the nematode C. elegans, another primitive organism that appears to require sleep.
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Sleep patterns vary widely among species, with some foregoing sleep for extended periods and some engaging in unihemispheric sleep
Unihemispheric sleep is a form of sleep in which one brain hemisphere sleeps while the other remains awake. This allows the animal to remain alert and responsive to its surroundings while still getting the rest it needs. Some varieties of shark, such as great whites and hammerheads, must remain in motion at all times to move oxygenated water over their gills. It is possible that they still sleep one cerebral hemisphere at a time as marine mammals do.
The need for sleep is in all organisms' DNA, but does not govern how that need is satisfied. That physiology evolves with each species as the environment still has a lot to say. For example, all animals need to retain the ability for arousal during sleep, but to different amounts and in different ways depending on their circumstances.
Sleep is an essential and complex biological process that needs to be satisfied to maintain many physiological functions, such as muscle recovery and repair, neurological development, cardiac, immune, and metabolic functions, cognition, and mood. Inadequate sleep is a threat to health because of its association with obesity, metabolic, immunological, and cardiovascular health, some types of cancer, pain, and mental illness.
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Sleep is necessary for changes in the neural system
The need for sleep is in all organisms' DNA, but the physiology of sleep evolves with each species and is influenced by the environment. For example, all animals need to retain the ability for arousal during sleep, but the amount and type of arousal vary depending on their circumstances. Some animals, such as rats, engage in unihemispheric sleep, where one brain hemisphere sleeps while the other remains awake.
Sleep patterns vary widely among species, with some foregoing sleep for extended periods. For example, some varieties of shark, such as great whites and hammerheads, must remain in constant motion to move oxygenated water over their gills. It is possible that these sharks still sleep one cerebral hemisphere at a time, as marine mammals do.
Observations of sleep states in jellyfish and other primitive organisms provide evidence that sleep does not require an animal to have a brain or central nervous system. However, sleep is necessary for changes in the neural system, as seen in the nematode *C. elegans*, which requires sleep during short periods preceding each moult. This suggests that sleep is primitively connected to developmental processes.
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Sleep is an essential and complex biological process that needs to be satisfied to maintain many physiological functions
Sleep is fundamentally important for all organisms. The need for sleep is in all organisms' DNA, but does not govern how that need is satisfied. The physiology of sleep evolves with each species and their environment. For example, all animals need to retain the ability for arousal during sleep, but to different amounts and in different ways depending on their circumstances. Unihemispheric sleep is another example of how sleep has been adapted to specific needs. Unihemispheric sleep is when one brain hemisphere sleeps while the other remains awake. This has been observed in some varieties of shark, such as great whites and hammerheads, which must remain in motion at all times to move oxygenated water over their gills.
Sleep is necessary for muscle recovery and repair, neurological development, cardiac, immune, and metabolic functions, cognition, and mood. Inadequate sleep is a threat to health because of its association with obesity, metabolic, immunological, and cardiovascular health, some types of cancer, pain, and mental illness.
Observing sleep states in jellyfish provides evidence that sleep states do not require that an animal have a brain or central nervous system. The nematode C. elegans is another primitive organism that appears to require sleep. Here, a lethargus phase occurs in short periods preceding each moult, a fact which may indicate that sleep primitively is connected to developmental processes.
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Inadequate sleep is a threat to health because of the association of insufficient sleep with obesity, metabolic, immunological, and cardiovascular health, some types of cancer, pain, and mental illness
Sleep is a biological requirement for all animals except for basal species with no brain or only a rudimentary brain. Sleep is an essential and complex biological process that needs to be satisfied to maintain many physiological functions, such as muscle recovery and repair, neurological development, cardiac, immune, and metabolic functions, cognition, and mood.
The need for sleep is in all organisms' DNA, but does not govern how that need is satisfied; that physiology evolves with each species as the environment still has a lot to say. For example, all animals need to retain the ability for arousal during sleep, but to different amounts and in different ways depending on their circumstances. Sleep patterns vary widely among species, with some foregoing sleep for extended periods and some engaging in unihemispheric sleep, in which one brain hemisphere sleeps while the other remains awake.
The association of insufficient sleep with obesity, metabolic, immunological, and cardiovascular health, some types of cancer, pain, and mental illness makes inadequate sleep a threat to health. Findings show that if rats do not get sleep, they die in a few weeks. Despite having enough food, their appetite tends to decrease, resulting in weight loss and eventually death.
Sleep-like states have been observed in some of the most primitive organisms, such as the fresh-water polyp Hydra vulgaris and the jellyfish Cassiopea. These observations provide evidence that sleep states do not require that an animal has a brain or central nervous system.
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Frequently asked questions
Sleep is a biological requirement for all animals except for basal species with no brain or only a rudimentary brain. Sleep is necessary for muscle recovery and repair, neurological development, cardiac, immune, and metabolic functions, cognition, and mood.
Inadequate sleep is a threat to health because of its association with obesity, metabolic, immunological, and cardiovascular health, some types of cancer, pain, and mental illness.
No, sleep patterns vary widely among species. Some forego sleep for extended periods, some engage in unihemispheric sleep (in which one brain hemisphere sleeps while the other remains awake), and some sleep in other ways.
