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Related Concept Videos

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REM Sleep Behavior Disorder

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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-Wake Cycles01:24

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Stages of Sleep01:22

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Related Experiment Video

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Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
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Rest-Activity Pattern Alterations in Idiopathic REM Sleep Behavior Disorder.

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Summary

Rest-activity pattern changes like increased napping and fragmentation are early signs of alpha-synucleinopathy. These actigraphy markers predict conversion from idiopathic REM sleep behavior disorder to clinical disease.

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Area of Science:

  • Neurology
  • Sleep Medicine
  • Biomarkers

Background:

  • Alpha-synucleinopathies are neurodegenerative diseases characterized by the accumulation of alpha-synuclein protein.
  • Idiopathic rapid eye movement (REM) sleep behavior disorder (iRBD) is a prodromal stage for several alpha-synucleinopathies.

Purpose of the Study:

  • To investigate differences in rest-activity patterns across stages of alpha-synucleinopathy.
  • To identify early actigraphy-based markers for predicting conversion from iRBD to clinically diagnosed alpha-synucleinopathy.

Main Methods:

  • A case-control study compared rest-activity patterns in patients with alpha-synucleinopathy, iRBD, and controls using 7-day actigraphy.
  • A nested case-control study examined baseline actigraphy data in iRBD patients who converted to alpha-synucleinopathy versus those who did not.

Main Results:

  • Patients with alpha-synucleinopathy and iRBD showed increased probable napping, activity fragmentation, and physical inactivity compared to controls.
  • Higher levels of these rest-activity alterations at baseline predicted conversion from iRBD to alpha-synucleinopathy within two years.

Conclusions:

  • Rest-activity pattern alterations, including probable napping, fragmentation, and inactivity, are early prodromal markers for alpha-synucleinopathy.
  • Actigraphy can identify individuals with iRBD at high risk of converting to clinically diagnosed alpha-synucleinopathy.