If you’ve ever struggled to get a full night’s rest, you know the frustration, staring at the ceiling, counting sheep, replaying the day in your head, or negotiating with your brain to “just shut off.”
Now imagine dealing with that kind of insomnia while also fighting cancer.
A new study published in Clinical and Translational Oncology offers hope and a bit of surprise, for people in that exact situation. Researchers at the University of Wisconsin–Madison reviewed data from 1,962 cancer patients enrolled in the Minnesota Medical Cannabis Program between 2015 and 2023. What they found is worth paying attention to.
What the Study Found
Participants rated their sleep disturbance on a 0–10 scale. At enrollment, the average score was 6.72. After starting medical cannabis treatment, that dropped by 1.63 points, a 24% improvement in sleep quality.
That’s encouraging, but here’s the twist: it wasn’t the THC doing the heavy lifting, it was the CBD.
Patients taking higher doses of CBD saw the biggest improvements, averaging a 1.87-point drop in sleep disturbance, nearly reaching what researchers consider clinically significant.
“Compared to the highest quintile category of CBD dose, lower dose quintiles were 29–35% less likely to be associated with at least a 30% improvement in sleep disturbance scores,” the study reported.
In plain English: more CBD, better sleep.
The study also found that THC, often thought of as the cannabinoid that “knocks you out”, wasn’t a consistent factor in improving sleep. Its effects were more hit-or-miss, possibly because THC’s sedative qualities can depend on timing, tolerance and individual brain chemistry.
Why This Matters
This is one of the largest studies ever conducted on cannabis use and sleep among cancer patients, a group for whom quality rest can directly affect healing, mood and daily function.
For years, patients and practitioners have noticed that CBD helps quiet the body and calm the mind without the “high.” Now science is catching up to what many have experienced firsthand: that CBD, especially at higher doses, may help restore the body’s natural rhythm of rest.
And while this research focused on cancer patients, the implications stretch further. Millions of Americans deal with insomnia, anxiety, and chronic pain, all of which can interfere with restorative sleep. Understanding how cannabinoids interact with our endocannabinoid system (ECS) opens the door to personalized approaches that go beyond counting sheep and reaching for another melatonin gummy.
What’s Still to Learn
Like most things in cannabis science, we’re still piecing together the puzzle. Why does CBD seem to improve sleep even when THC doesn’t? Is it related to inflammation, cortisol levels or ECS modulation?
The answer likely involves several mechanisms and that’s part of what makes cannabinoid science so fascinating. Every new study like this one helps refine how we use these compounds safely, effectively, and compassionately.
Final Thoughts
If CBD were a person, it might be the calm friend who helps you unwind after a long day, not the one who drags you to a party. THC gets the headlines, but CBD’s quiet consistency is what often makes a real difference.
So, if sleep has been elusive, or you’re navigating health challenges where rest is essential, CBD could be worth discussing with your healthcare provider. And if you’re a healthcare professional, now’s the time to explore how cannabinoid education can enhance patient outcomes.
Want to Learn More? At Herbal IQ, we bridge science and experience to help people make informed, evidence-based decisions about cannabis, CBD, and holistic wellness.
Whether you’re a patient, practitioner, or simply curious, our mission is simple: education, experience, advocacy and genuine care.
💬 Connect with us to learn more about how cannabinoids can support better sleep and overall wellness.
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References:
- Martinelli, A. (2025, October). Study Finds CBD Can Improve Sleep in Cancer Patients, Especially at Higher Doses. The Marijuana Herald.
- Clinical and Translational Oncology (2025). University of Wisconsin–Madison, Minnesota Medical Cannabis Program study, 2015–2023.
