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Related Concept Videos

Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Understanding Sleep01:11

Understanding Sleep

Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...
Tonicity in Animals00:59

Tonicity in Animals

The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...
Osmoregulation in Insects01:47

Osmoregulation in Insects

Malpighian tubules are specialized structures found in the digestive systems of many arthropods, including most insects, that handle excretion and osmoregulation. The tubules are typically arranged in pairs and have a convoluted structure that increases their surface area.
Stages of Sleep01:22

Stages of Sleep

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.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
Parental Care00:55

Parental Care

Many animals exhibit parental care behavior, including feeding, grooming, and protecting young offspring. Parental care is universal in mammals and birds, which often have young that are born relatively helpless. Several species of insects and fish, as well as some amphibians, also care for their young.

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Related Experiment Video

Updated: May 29, 2026

The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila
06:06

The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila

Published on: December 14, 2020

Ostriches sleep like platypuses.

John A Lesku1, Leith C R Meyer, Andrea Fuller

  • 1Max Planck Institute for Ornithology, Seewiesen, Germany.

Plos One
|September 3, 2011
PubMed
Summary
This summary is machine-generated.

The study reveals that ostriches exhibit a unique sleep pattern, blending characteristics of both slow wave sleep (SWS) and rapid eye movement (REM) sleep. This suggests a shared evolutionary path for sleep states in birds and mammals from a single ancestral state.

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Automated Measurements of Sleep and Locomotor Activity in Mexican Cavefish
05:10

Automated Measurements of Sleep and Locomotor Activity in Mexican Cavefish

Published on: March 21, 2019

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The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila
06:06

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Published on: December 14, 2020

Automated Measurements of Sleep and Locomotor Activity in Mexican Cavefish
05:10

Automated Measurements of Sleep and Locomotor Activity in Mexican Cavefish

Published on: March 21, 2019

Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Comparative Psychology

Background:

  • Mammals and birds typically exhibit two distinct sleep states: slow wave sleep (SWS) and rapid eye movement (REM) sleep.
  • Monotremes, basal mammals, display a single sleep state combining SWS and REM elements, suggesting temporal segregation occurred later in mammalian evolution.
  • The sleep patterns of basal birds remain largely uncharacterized, leaving a gap in understanding sleep evolution.

Purpose of the Study:

  • To describe the brain activity during sleep in ostriches, a basal bird species.
  • To investigate whether sleep in basal birds resembles that of monotremes or other birds and mammals.
  • To elucidate the evolutionary trajectory of SWS and REM sleep.

Main Methods:

  • Electroencephalography (EEG) and electromyography (EMG) to record brain activity and muscle tone in ostriches during sleep.
  • Analysis of eye movements and head movements during different sleep stages.
  • Comparison of ostrich sleep patterns with existing data from other avian and mammalian species.

Main Results:

  • Ostrich sleep is characterized by unique brain activity patterns.
  • REM sleep episodes in ostriches feature rapid eye movements, reduced muscle tone, and head movements.
  • During REM sleep, ostrich forebrain activity alternates between REM-like activation and SWS-like slow waves, similar to platypus sleep.
  • Ostriches exhibit a higher proportion of REM sleep than other birds, paralleling platypuses' higher REM sleep in mammals.

Conclusions:

  • The findings suggest a recurring evolutionary pattern where a single, heterogeneous sleep state segregated into distinct SWS and REM states.
  • Forebrain activation during REM sleep appears to be an evolutionarily recent development.
  • This evolutionary trajectory implies that REM sleep's unique functions may have emerged later in animals with more complex nervous systems.