Cannabis use and sleep quality in daily life: An electronic daily diary study of adults starting cannabis for health concerns

•Daily diaries are well-suited to variable, real-world use for health concerns.•Daily diary reports align with cannabis assessments from interviews and urinalysis.•Adults randomized to medical cannabis cards (MCC) report better sleep on use days than non-use days.•Long-term improvements in sleep parallel increases in the frequency of use days.•No cannabis-related improvements are seen for pain and mood symptoms.