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If Weed Helps Me Sleep, Why Does Science Say It Doesn’t? – WebMD

✦ New
CED Clinical Relevance
#68 Notable Clinical Interest
Emerging findings or policy developments worth monitoring closely.
SleepResearchTHCDosingMental Health
Why This Matters
If you are using cannabis to manage sleep problems, understanding that it may ease the feeling of sleeplessness without fully restoring normal sleep cycles can help you make more informed decisions about long-term use and when to seek additional evaluation.
Clinical Summary

Cannabis and sleep have a complicated relationship that standard research frameworks struggle to capture accurately. Many patients report meaningful subjective improvements in sleep onset and overnight waking, yet controlled studies frequently show that THC can suppress REM sleep, reduce sleep architecture quality over time, and create rebound insomnia upon discontinuation. The disconnect between patient-reported outcomes and objective polysomnographic data likely reflects real but different phenomena, where cannabis may reduce the distress of sleeplessness without necessarily restoring healthy sleep biology.

Dr. Caplan’s Take
“Dismissing patient sleep reports as placebo while also failing to fund the rigorous, long-term cannabinoid sleep trials that would actually resolve this question is not scientific humility, it is scientific negligence.”
Clinical Perspective

The disconnect between patient-reported sleep benefits and limited clinical evidence reflects a genuine gap in cannabis research rather than patient error. While THC’s sedating effects are well-documented at the pharmacological level, most controlled studies are too short to capture sleep architecture changes or tolerance development over weeks of use. The anecdotal effectiveness likely stems from THC’s anxiolytic properties reducing pre-sleep worry, though this differs mechanistically from promoting healthy sleep architecture. High-quality, longer-duration RCTs examining dose, timing, cannabinoid ratios, and individual variability are needed to reconcile patient experience with scientific understanding. Until then, clinicians should acknowledge both the subjective improvements patients experience and the objective limitations in our evidence base when discussing cannabis for sleep.

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