Medical Cannabis Patients With Sleep Problems Saw Greater Pain Improvements Over 12 Months | Research

The takeaway

Among 1,139 UK chronic pain patients prescribed medical cannabis, those with co-occurring sleep impairment showed greater improvements in pain severity over 12 months compared to those without sleep problems.

Chronic pain patients considering medical cannabis; pain medicine clinicians; sleep medicine professionals

Sleep-impaired patients had significantly greater pain improvement at all timepoints over 12 months

What the researchers found

Sleep-impaired patients showed improvements across all patient-reported outcomes at every follow-up. The sleep-impaired group had greater improvements in pain severity and sleep quality compared to the sleep-unimpaired group at all timepoints. No significant difference in adverse events between groups.

Why it matters

Sleep and pain are deeply intertwined, and this study suggests medical cannabis may particularly benefit chronic pain patients who also have poor sleep.

The numbers in context

1,139 patients (517 sleep-impaired, 622 unimpaired). Sleep-impaired group: significant improvements in all PROMs at all timepoints. Greater BPI pain severity improvement (P < 0.05) and sleep quality improvement (P < 0.001) vs unimpaired group. 2,817 total adverse events reported.

How the study worked

Prospective cohort from the UK Medical Cannabis Registry. 1,139 chronic pain patients divided by baseline sleep quality (impaired n=517, unimpaired n=622). Outcomes measured at 1, 3, 6, and 12 months using validated scales.

What this study cannot tell us

Observational registry without a control group or placebo. Greater improvement in sleep-impaired group may reflect regression to the mean. Confounders including baseline pain severity. No randomization.

How to read the evidence

Large prospective registry with 12-month follow-up; moderate because of observational design without placebo control.

When this study was published

2025 publication from the UK Medical Cannabis Registry

The bigger picture

This is one of the largest and longest prospective studies of medical cannabis for chronic pain, from a real-world clinical registry rather than a controlled trial.

Questions still open

Is the greater improvement in sleep-impaired patients due to cannabis treating both pain and sleep, or just regression to the mean? Would a randomized trial confirm these findings? What specific cannabis products were most effective?

Common questions

Does medical cannabis help with both pain and sleep?

In this observational study, patients with both chronic pain and sleep problems improved on both measures over 12 months. However, without a control group, it is unclear how much of the improvement is due to cannabis versus other factors.

Were there many side effects?

2,817 adverse events were self-reported across both groups, with no significant difference between sleep-impaired and unimpaired patients. The study did not detail severity or specific adverse events in the abstract.

Read the original research

UK medical cannabis registry: A clinical outcome analysis of medical cannabis therapy in chronic pain patients with and without co-morbid sleep impairment.

Pain practice : the official journal of World Institute of Pain, 25(1), e13438

View on PubMed ↗Publisher’s paper ↗

Citation

Datta, Ishita; Erridge, Simon; Holvey, Carl; Coomber, Ross; Guru, Rahul; Holden, Wendy; Darweish Medniuk, Alia; Sajad, Mohammed; Searle, Robert; Usmani, Azfer; Varma, Sanjay; Rucker, James J; Platt, Michael; Sodergren, Mikael H. (2025). UK medical cannabis registry: A clinical outcome analysis of medical cannabis therapy in chronic pain patients with and without co-morbid sleep impairment.. Pain practice : the official journal of World Institute of Pain, 25(1), e13438. https://doi.org/10.1111/papr.13438