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Related Concept Videos

Substance Use Disorders Affecting Sleep01:24

Substance Use Disorders Affecting Sleep

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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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REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
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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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The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
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Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.
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Related Experiment Video

Updated: Oct 28, 2025

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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The Sleep Regularity Questionnaire: development and initial validation.

Joseph M Dzierzewski1, Emily K Donovan1, Sahar M Sabet1

  • 1Department of Psychology, Virginia Commonwealth University, 806 West Franklin St., PO Box 842018, Richmond, VA, 23284-2018, USA.

Sleep Medicine
|July 18, 2021
PubMed
Summary

The new Sleep Regularity Questionnaire (SRQ) is a reliable tool for measuring sleep regularity. This validated instrument assesses circadian and sleep continuity regularity in adults.

Keywords:
Intraindividual variabilityMeasurementPsychometricsSelf-reportSleep inconsistencySleep regularity

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Area of Science:

  • Sleep science
  • Psychometrics
  • Health behavior research

Background:

  • Sleep is crucial for health, functioning, and longevity.
  • Sleep regularity, or consistency, is increasingly recognized as important.
  • No brief subjective measure of sleep regularity currently exists.

Purpose of the Study:

  • Develop the Sleep Regularity Questionnaire (SRQ).
  • Examine the psychometric properties of the SRQ using construct validation.

Main Methods:

  • Online study with 3249 participants.
  • Participants completed the in-development SRQ, Insomnia Severity Index, and Pittsburgh Sleep Quality Index.
  • Exploratory and confirmatory factor analyses were conducted.

Main Results:

  • A two-factor structure (circadian regularity, sleep continuity regularity) was identified with good model fit.
  • The SRQ demonstrated good test-retest reliability.
  • Concurrent, convergent, and incremental validity were promising.

Conclusions:

  • The SRQ is a valid and stable instrument for assessing sleep regularity in adults.
  • The SRQ is related to, yet distinct from, other sleep constructs.
  • Future research should validate the SRQ in clinical samples and compare it to objective measures.