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Related Concept Videos

Phylogeny01:23

Phylogeny

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Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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Insufficient Sleep and Sleep Deprivation01:13

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Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
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Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
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Quantitative Measurement of the Immune Response and Sleep in Drosophila
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Exploring phylogeny to find the function of sleep.

Ron C Anafi1,2, Matthew S Kayser2,3, David M Raizen4,5,6

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Nature Reviews. Neuroscience
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Sleep is ancient and essential, persisting across species despite risks. New research suggests sleep

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Area of Science:

  • Comparative biology
  • Evolutionary biology
  • Neuroscience

Background:

  • Sleep is a conserved biological state observed across diverse species.
  • Despite evolutionary pressures (e.g., predation risk), sleep persists due to its essential functions.
  • Sleep deprivation has significant negative consequences, highlighting its importance.

Purpose of the Study:

  • To provide an overview of sleep across various species.
  • To investigate the original evolutionary purpose of sleep.
  • To explore the metabolic functions of sleep in both neural and non-neural tissues.

Main Methods:

  • Review of existing scientific literature on sleep across diverse animal species.
  • Analysis of sleep patterns in organisms with and without complex nervous systems.
  • Examination of the influence of non-neuronal signals, such as metabolic rhythms, on sleep.

Main Results:

  • Sleep is phylogenetically ancient, potentially existing in the earliest animals.
  • Sleep occurs in animals lacking centralized nervous systems (cephalization).
  • Non-neuronal signals, including metabolic rhythms, can influence sleep.

Conclusions:

  • Sleep likely evolved to serve fundamental metabolic functions.
  • These metabolic functions are crucial in both neural and non-neural tissues.
  • The ancient origins and pervasive nature of sleep underscore its vital biological role.