New tool helps doctors spot when cannabis use is worsening insomnia

Many people use alcohol and cannabis as sleep aids, believing these substances will help them fall asleep more easily. However, research shows that relying on these drugs for sleep actually perpetuates insomnia symptoms over time, creating a problematic cycle. This study developed and validated a new assessment tool called the DBAS-S (Dysfunctional Beliefs about Sleep Scale - Substance use version) to help healthcare providers identify when patients are using substances like cannabis and alcohol as sleep remedies—something that standard sleep assessments typically miss. The researchers tested this 11-item scale with over 900 participants, about two-thirds of whom had at least mild insomnia.

The DBAS-S proved to be an effective and reliable screening tool that combines traditional sleep belief assessments with substance use expectancies. The scale successfully identified dysfunctional beliefs about sleep and captured expectations about how alcohol and cannabis might improve sleep. Notably, the researchers found that a single question about cannabis sleep beliefs was more predictive of actual cannabis use than longer, previously validated scales, suggesting these brief substance-focused items are surprisingly powerful. The substance use component of the scale accounted for meaningful additional variance in insomnia severity beyond traditional sleep beliefs alone, and it showed associations with both current and future alcohol and cannabis use patterns.

This validation represents an important clinical advance because it flags substance use expectancies—particularly regarding cannabis—as a crucial but often-overlooked factor in insomnia treatment. By integrating substance use assessment into standard sleep evaluations, clinicians can now better understand whether patients are inadvertently worsening their insomnia by self-medicating with drugs, opening pathways for more targeted, effective interventions that address the root causes of sleep problems rather than band-aid solutions.