Patients feel better; their sleep quality may not be
STUDY: Velzeboer R et al, Journal of Clinical Sleep Medicine 2026;22:82
STUDY TYPE: Editorial with synthesis of meta-analyses and observational studies
FUNDING: Independent
Background
This editorial synthesizes the current evidence on cannabis and sleep, drawing on multiple recent meta-analyses and longitudinal studies to help clinicians counsel patients more precisely.
- The review examined both subjective sleep outcomes (quality ratings, insomnia severity) and objective measures (polysomnography, actigraphy)
- It covers acute effects, long-term use patterns, withdrawal, and psychiatric risks
Results
If we look at subjective report, cannabis seems to improve sleep quality, as a meta-analysis of six randomized trials found. But these benefits are only short term (1-8 weeks), and fade over 18 months even as dosing escalates.
The objective picture is less reassuring. Sleep is lighter with more awakenings on cannabis, according to two observational studies. On EEG, THC suppresses REM sleep, reduces deep sleep (N3), and disrupts sleep microarchitecture.
And when patients say they can’t sleep without cannabis, that’s not always proof it’s working. It may reflect withdrawal. Cannabis cessation reliably causes difficulty falling asleep, reduced total sleep time, and REM rebound lasting at least two weeks.
Frequent cannabis use also carries psychiatric risks, most notably psychosis with high-THC, near-daily use, cognitive problems that resemble ADHD, and emerging links to depression.
Practice Implications
When a patient says cannabis is the only thing that helps them sleep, ask two questions:
- Has your dose gone up over time?
- What happens if you miss a night?
The answers often reveal escalating tolerance or withdrawal-driven insomnia masquerading as therapeutic benefit.
— Chris Aiken, MD
Director, Psych Partners
Editor in Chief, Carlat Psychiatry Report
