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This summary is machine-generated.

Cannabis use may improve sleep, but beliefs about its effects can skew self-reported sleep quality. This study found that positive cannabis expectancies amplified discrepancies between subjective and objective sleep measures, especially on cannabis use days.

Keywords:
Cannabisactigraphyexpectanciesmeasurementsleep

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Area of Science:

  • Sleep Medicine
  • Cannabis Research
  • Psychology

Background:

  • Cannabis use is often linked to self-reported sleep benefits.
  • Objective sleep studies show inconsistent results regarding cannabis and sleep.
  • Social cognitive theory suggests beliefs (expectancies) can influence outcomes.

Purpose of the Study:

  • To assess agreement between subjective (diary) and objective (actigraphy) sleep measures.
  • To investigate if cannabis expectancies influence subjective sleep reports.
  • To examine how expectancies affect discrepancies between subjective and objective sleep on cannabis use days.

Main Methods:

  • Daily diaries and actigraphy were used for up to seven days.
  • Participants (N=23) had regular cannabis use and sleep motives.
  • Baseline measures included cannabis use, sleep patterns, and expectancies.

Main Results:

  • Agreement between diary and actigraphy was poor for wake after sleep onset and sleep onset latency.
  • Agreement was moderate for total sleep time and excellent for fall asleep time and wake-time.
  • Positive expectancies led to overestimation of total sleep time, amplified on cannabis use days.

Conclusions:

  • Sleep-related cannabis expectancies can bias self-reported sleep quality.
  • Future research should consider expectancies when examining cannabis-sleep relationships using subjective measures.
  • Objective measures are crucial for accurate sleep assessment in cannabis users.