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Subjective-Objective Sleep Discrepancy in Schizophrenia.

Ka-Fai Chung1, Yvonne Patricia Yuan-Ping Poon2, Ting-Kin Ng3

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Behavioral Sleep Medicine
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Summary
This summary is machine-generated.

In schizophrenia patients, sleep diaries often overestimate sleep duration and efficiency compared to actigraphy. Factors like marital status and psychosocial functioning influence these subjective-objective sleep discrepancies.

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Area of Science:

  • Psychiatry
  • Sleep Medicine
  • Biomedical Engineering

Background:

  • Subjective sleep assessments are common but may not align with objective findings, particularly in schizophrenia.
  • Limited data exist on the agreement between subjective and objective sleep measures in schizophrenia patients.

Purpose of the Study:

  • To evaluate the agreement between 1-week actigraphy and sleep diary-derived sleep parameters in schizophrenia outpatients.
  • To identify factors contributing to discrepancies between subjective and objective sleep measurements.

Main Methods:

  • A secondary analysis was conducted on 66 schizophrenia outpatients.
  • Agreement was assessed using ANOVA, Pearson's correlation, and Bland-Altman plots.
  • Discrepancy magnitude was quantified using Cohen's d; contributing factors were analyzed using Pearson's correlation with Benjamini-Hochberg correction.

Main Results:

  • Sleep diaries overestimated sleep onset latency (20.45 min), total sleep time (37.63 min), and sleep efficiency (4.29%), while underestimating wake after sleep onset (33.28 min).
  • Cohen's d values for discrepancies ranged from 0.61 to 1.41.
  • Discrepancies were significantly associated with marital status, employment, self-reported sleep disturbance, delayed sleep-wake phase disorder, chronotype, and psychosocial functioning (corrected p < .05).

Conclusions:

  • Significant differences exist between subjective and objective sleep measurements in schizophrenia.
  • Clinical judgment is advised when patients with schizophrenia are suspected of overestimating sleep difficulties.
  • Further research should explore the benefits of actigraphy feedback for schizophrenia patients with sleep disturbances.