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Related Concept Videos

Insufficient Sleep and Sleep Deprivation01:13

Insufficient Sleep and Sleep Deprivation

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Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
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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, 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.
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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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Somnambulism, commonly known as sleepwalking, involves individuals engaging in activities ranging from simple walking to more complex behaviors such as driving. Sleepwalking typically occurs during the slow-wave sleep stages 3 and 4 early in the night when the person is not dreaming, contradicting the myth that sleepwalkers are acting out their dreams.
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Substance use disorders involve a pattern of using drugs more extensively than intended and continuing use despite harmful consequences. This includes legal substances like alcohol and nicotine, as well as illegal drugs. These disorders often involve both physical and psychological dependence, reflecting compulsive use of substances that significantly alter thoughts, feelings, and behaviors, contributing to a major public health issue.
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Sleep Is a Refreshing Process: An fNIRS Study.

Adile Oniz1,2, Gonca Inanc3, Serhat Taslica3

  • 1Department of Biophysics, Faculty of Medicine, Dokuz Eylul University, Izmir, Turkey.

Frontiers in Human Neuroscience
|June 4, 2019
PubMed
Summary
This summary is machine-generated.

This study reveals that the prefrontal cortex (PFC) shows increased oxygenation by the end of sleep, indicating brain refreshment. The Rapid Eye Movement (REM) sleep stage appears crucial for this restorative process.

Keywords:
brain hemodynamicsfNIRSprefrontal cortexrefreshmentsleep

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Area of Science:

  • Neuroscience
  • Sleep Science
  • Physiology

Background:

  • Sleep is vital, occupying one-third of adult life for bodily and brain restoration.
  • Sleep architecture includes circadian rhythms and distinct sleep stages, each with unique physiological demands.
  • While sleep hemodynamics are studied, the specific mechanisms of brain refreshment across sleep stages require further illumination.

Purpose of the Study:

  • To investigate the refreshing properties of sleep stages by examining prefrontal cortex (PFC) hemodynamics.
  • To utilize functional near-infrared spectroscopy (fNIRS) to measure hemodynamic changes during different sleep stages and wakefulness.

Main Methods:

  • Nine healthy subjects underwent polysomnography and fNIRS monitoring during overnight sleep.
  • Hemodynamic parameters, including oxyhemoglobin (HbO) and total hemoglobin (HbT), were measured before, during, and after sleep.
  • Data analysis focused on comparing hemodynamic profiles across wakefulness and various sleep stages, particularly REM sleep.

Main Results:

  • The Rapid Eye Movement (REM) sleep stage exhibited lower oxyhemoglobin (HbO) and total hemoglobin (HbT) compared to other stages and wakefulness.
  • No significant differences in deoxyhemoglobin (HbR) were observed between any sleep stages.
  • All sleep stages and the final wakefulness period showed increased HbO and decreased HbR compared to the sleep onset, signifying enhanced PFC oxygenation.

Conclusions:

  • PFC hemodynamics suggest reduced blood supply during REM sleep, potentially due to reallocation of resources to other brain regions.
  • Increased PFC oxygenation towards the end of sleep, irrespective of stage, indicates a general refreshment process.
  • The brain actively engages in 'cleaning' and 'refreshing' functions during sleep, with hemodynamic shifts serving as potential indicators, highlighting the central role of REM sleep.