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Related Experiment Videos

Delayed and advanced sleep phase symptoms.

Katsuhisa Ando1, Daniel F Kripke, Sonia Ancoli-Israel

  • 1Department of Psychiatry, University of California, San Diego, California, USA.

The Israel Journal of Psychiatry and Related Sciences
|May 17, 2002
PubMed
Summary

Many adults aged 40-64 report sleep issues suggesting circadian rhythm disorders. However, these common complaints often don't align with objectively measured sleep patterns, indicating a potential disconnect in diagnosis.

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Area of Science:

  • Sleep Medicine
  • Chronobiology
  • Psychiatry

Background:

  • Circadian rhythm sleep disorders are defined by a mismatch between internal body clocks and external schedules.
  • Understanding the prevalence of these disorders in middle-aged adults is crucial for accurate diagnosis and treatment.

Purpose of the Study:

  • To investigate the prevalence of circadian rhythm sleep disorders based on DSM-IV criteria in adults aged 40-64.
  • To correlate subjective sleep complaints with objectively measured sleep timing and environmental light exposure.

Main Methods:

  • A population-based sample of adults aged 40-64 years was recruited.
  • Participants underwent interviews for sleep complaints and objective sleep timing was recorded using wrist activity monitors.
  • Environmental illumination data was collected to assess light exposure.

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Main Results:

  • Complaints suggestive of circadian rhythm advance (early waking, difficulty staying awake) were reported by 7.4% of participants.
  • Complaints suggesting circadian rhythm delay (difficulty falling asleep, difficulty waking) were reported by 3.1%.
  • No significant correlations were found between subjective complaints and objectively measured sleep timing or light exposure.

Conclusions:

  • Subjective complaints indicative of circadian rhythm sleep disorders are common in middle-aged adults.
  • These complaints frequently do not correspond with objective measures of sleep timing or circadian misalignment.
  • Further research is needed to reconcile subjective experiences with objective findings for improved diagnostic accuracy.