A sleep psychologist says the success of cannabis as a sleep aid is highly individual, reports The Conversation.

We were interested in how sleep quality differs between daily cannabis users, occasional users who smoked at least once in the last month and people who don’t smoke at all.

We asked 98 mostly young and healthy male volunteers to answer surveys, keep daily sleep diaries and wear accelerometers for one week. Accelerometers, or actigraphs, measure activity patterns across multiple days. Throughout the study, subjects used cannabis as they typically would.

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