Marijuana's Effect on Sleeping Still Unclear

At least once a week, I hear from patients that smoking marijuana helps them to relax and to sleep. I know that other clinicians hear the same thing because they ask me about it at insomnia workshops. Does cannabis really improve sleep?

Several studies done in the 1970s examined the effects of smoked marijuana on objective sleep patterns, measured using polysomnography. This method of overnight recording involves the tracking of brain waves, eye movements and muscle tone in order to distinguish the sleep stages and their pattern of occurrence throughout the night.

Contrary to popular belief, smoking marijuana did not necessarily make it easier to get to sleep. Participants in some studies fell asleep faster while those in other studies took somewhat longer to fall asleep. There were also inconsistent effects on the amount of slow wave sleep, or deep sleep. The most consistent finding across these studies was that...

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