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Related Concept Videos

REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

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.
RBD is significantly associated with...
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:
Naturalistic Observations02:30

Naturalistic Observations

If you want to understand how behavior occurs, one of the best ways to gain information is to simply observe the behavior in its natural context. However, people might change their behavior in unexpected ways if they know they are being observed. How do researchers obtain accurate information when people tend to hide their natural behavior? As an example, imagine that your professor asks everyone in your class to raise their hand if they always wash their hands after using the restroom. Chances...

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Related Experiment Video

Updated: May 15, 2026

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
08:20

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood

Published on: October 2, 2019

Actigraphy reliability with normal sleepers.

Yuriy Ustinov1, Kenneth L Lichstein

  • 1a The University of Alabama.

Behavioral Sleep Medicine
|December 28, 2012
PubMed
Summary
This summary is machine-generated.

Missing data significantly impacts actigraphy

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Multi-Modal Home Sleep Monitoring in Older Adults
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Multi-Modal Home Sleep Monitoring in Older Adults

Published on: January 26, 2019

Related Experiment Videos

Last Updated: May 15, 2026

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
08:20

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood

Published on: October 2, 2019

Multi-Modal Home Sleep Monitoring in Older Adults
07:40

Multi-Modal Home Sleep Monitoring in Older Adults

Published on: January 26, 2019

Area of Science:

  • Sleep science
  • Biomedical engineering

Background:

  • Actigraphy is a popular objective method for home sleep measurement.
  • Evaluating the impact of missing data on actigraphy utility is crucial for normal sleepers.

Purpose of the Study:

  • To assess the effect of missing data on actigraphy's utility for measuring sleep parameters in normal sleepers.
  • To identify the primary sources of missing data in actigraphy studies.

Main Methods:

  • Actigraphy data from 60 normal sleepers over 35 days were analyzed.
  • Usable data criteria included: missing nights, missing/multiple bedtime/arising time markers.
  • Unscorable nights were counted based on these criteria.

Main Results:

  • 27% (559/2100) of nights were unscorable due to missing data.
  • Missing bedtime (206) and arising time (172) markers were the main contributors.
  • The incidence of missing data increased over the five-week assessment period.

Conclusions:

  • Missing data presents a significant challenge for long-term actigraphy sleep assessment.
  • Researchers should consider extending study duration and using supplementary measures.
  • Future actigraphy device improvements should target reducing data loss.