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Related Concept Videos

Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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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
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Insufficient Sleep and Sleep Deprivation01:13

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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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Understanding Sleep01:11

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Stages of Sleep01:22

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Related Experiment Videos

Sleep inconsistency between weekends and weekdays is associated with changes in brain function during task and rest.

Rui Zhang1, Dardo Tomasi1, Ehsan Shokri-Kojori1

  • 1Laboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD.

Sleep
|April 26, 2020
PubMed
Summary

Weekend sleep consistency matters for cognitive function. Longer weekend sleep improves attention and brain connectivity, while later weekend sleep impairs performance and alters brain activity.

Keywords:
brain imagingcircadian misalignmentdefault mode networkresting-state functional connectivitysleep inconsistencyvisual attention taskweekend catch-up sleep

Related Experiment Videos

Area of Science:

  • Neuroscience
  • Sleep Science
  • Cognitive Psychology

Background:

  • Sleep deprivation and circadian rhythm disruptions negatively impact cognitive functions.
  • Limited research exists on the effects of sleep inconsistency on behavior and brain function.

Purpose of the Study:

  • To investigate the correlation between weekend-weekday sleep duration and timing inconsistencies and changes in behavior and brain function.
  • To examine brain activity during a visual attention task and at rest using fMRI.

Main Methods:

  • Actigraphy data collected over one week to calculate weekend-weekday sleep duration and midpoint differences.
  • 3 Tesla fMRI scans to measure brain activity during a visual attention task and resting-state conditions in 56 healthy adults.

Main Results:

  • Weekend-weekday sleep duration and timing inconsistencies were uncorrelated and had distinct effects.
  • Longer weekend sleep duration correlated with improved attentional performance and enhanced default mode network (DMN) deactivation and connectivity.
  • Later weekend sleep timing correlated with worse performance, reduced occipital activation, and decreased resting-state functional connectivity (RSFC) within the DMN.

Conclusions:

  • Consistent sleep timing is crucial for optimal brain function, particularly for the DMN.
  • Weekend 'catch-up' sleep, specifically longer sleep duration, demonstrates benefits for cognitive performance and brain function in healthy adults.