Higher CBD Doses Improved Sleep in Nearly 2,000 Cancer Patients in Minnesota Medical Cannabis Program | Research

The takeaway

Among 1,962 cancer patients in Minnesota's medical cannabis program, higher CBD doses were associated with clinically meaningful sleep improvements, while THC doses were not consistently helpful.

Oncologists recommending cannabis for sleep, medical cannabis patients with cancer, sleep researchers.

1.87-point sleep improvement at highest CBD dose

What the researchers found

Among 1,962 cancer patients enrolled in the Minnesota Medical Cannabis Program (2015-2023), those in the highest CBD dose quintile showed sleep improvement of 1.87 points on a 0-10 scale, compared to approximately 1.5 points for lower quintiles. Lower CBD dose quintiles were 29-35% less likely to achieve at least 30% improvement in sleep scores. THC doses and THC:CBD ratios were not consistently related to sleep improvement.

Why it matters

Sleep problems are among the most common and distressing symptoms for cancer patients. This is one of the largest real-world studies to separate CBD and THC effects on sleep, and the finding that CBD drives sleep improvement more than THC challenges the common assumption that THC is the primary sleep-active cannabinoid.

The numbers in context

1,962 cancer patients. 2015-2023. Highest CBD quintile: 1.87-point sleep improvement (0-10 scale). Lower quintiles: ~1.5-point improvement. 29-35% less likely to achieve 30% improvement at lower CBD doses. THC: no consistent association.

How the study worked

Patient-reported outcomes from 1,962 cancer patients in the Minnesota Medical Cannabis Program (2015-2023). Multivariable logistic and linear regression models assessed associations between sleep disturbance changes and CBD dose, THC dose, and THC:CBD ratio, adjusted for demographics, BMI, and enrollment fee category.

What this study cannot tell us

Observational design without placebo control. Patient-reported outcomes subject to expectation effects. Cannot determine optimal CBD dose precisely from quintile analysis. Program participants may differ from general cancer population. Cannabis product formulations varied over the study period.

How to read the evidence

Moderate: large real-world patient cohort (N=1,962) with dose-response analysis, though observational design and lack of placebo control limit causal conclusions.

When this study was published

2025 study (data from 2015-2023)

The bigger picture

Cancer patients frequently use cannabis for sleep, but most products and advice focus on THC as the sleep compound. This large observational study suggests CBD may be more important for sleep, potentially shifting how medical cannabis is recommended for cancer-related sleep disturbance.

Questions still open

What is the minimum effective CBD dose for sleep improvement in cancer patients? Would a randomized trial confirm CBD superiority over THC for sleep? Does the sleep benefit persist long-term or diminish with tolerance?

Common questions

Does cannabis help cancer patients sleep?

In nearly 2,000 cancer patients, higher CBD doses were associated with meaningful sleep improvements. Interestingly, THC doses were not consistently related to sleep improvement.

Is CBD or THC better for sleep?

In this large cancer patient study, CBD showed a clear dose-response relationship with sleep improvement while THC did not, suggesting CBD may be the more important cannabinoid for sleep in this population.

Read the original research

The effects of tetrahydrocannabinol and cannabidiol on sleep in cancer patients.

Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico

View on PubMed ↗Publisher’s paper ↗

Citation

Reddy, Apoorva C; Hampton, John M; Park, Susan J; Dickerson, Faith; Chewning, Betty; Schmitz, Natalie; Kwekkeboom, Kristine; Neuman, Heather; Trentham-Dietz, Amy. (2025). The effects of tetrahydrocannabinol and cannabidiol on sleep in cancer patients.. Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico. https://doi.org/10.1007/s12094-025-04069-8