So, what does the research say? In one study, researchers used data from more than 21,000 US residents about their cannabis-taking habits and their sleep patterns. They've found that using the drug either made people sleep for a shorter period (less than 6) or longer than ideal (over 9 hours). They’ve also found that heavy users (people who took cannabis over 20 times in the past 30 days) had their sleeping time deviate from the ideal even more.
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