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In cats, the sleep cycle lasts about 30 minutes, though it is about 12 minutes in rats and up to 120 minutes in elephants (In this regard, the ontogeny of the sleep cycle appears proportionate with metabolic processes, which vary in proportion with organism size. However, shorter sleep cycles detected in some elephants complicate this theory).
Initially, it was thought that sleep was simply a mechanism for the body to "take a break" and reduce wear. Later observations of the low metabolic rates in the brain during sleep seemed to indicate some metabolic functions of sleep. [109] This theory is not fully adequate as sleep only decreases metabolism by about 5–10%.
Under such a protocol, sleep and wake episodes are uncoupled from the body's endogenous circadian period, which allows researchers to assess the effects of circadian phase (i.e., the relative timing of the circadian cycle) on aspects of sleep and wakefulness including sleep latency and other functions - both physiological, behavioral, and ...
A 2023 study published in Sleep found that sleep regularity was a stronger predictor of overall mortality risk than sleep duration. Participants with higher SRI scores had as much as a 48% lower ...
The term polyphasic sleep was first used in the early 20th century by psychologist J. S. Szymanski, who observed daily fluctuations in activity patterns. [2] It does not imply any particular sleep schedule. The circadian rhythm disorder known as irregular sleep-wake syndrome is an example of polyphasic sleep in
Sleep is a state of reduced mental and ... to various points in the sleep-wake ... theory is strengthened by the fact that sleep is observed to be a ...
Frédéric Bremer (28 June 1892 – 7 April 1982) was a pioneer in the field of neurophysiology, whose work specialized in the neural mechanisms involved in the sleep-wake cycle. His other works include research into aphasia and apraxia , the neurogenic origin of diabetes insipidus , the physiology of the cerebellum , and the neural control of ...
[1] [2] This term from electrical engineering denotes a circuit in which mutual inhibition means that each component of the circuit, as it turns on, turns the other off, resulting in rapid transitions from one state (wake or sleep) to the other, with minimal time in transition states. This theory has been used to create mathematical models that ...