This is a complicated one, because it involves effects that can be both positive and negative. Marijuana disturbs sleep cycles by interrupting the later stages of REM sleep. In the long run, this could be a problem for frequent users. However, for people suffering from serious nightmares, especially those associated with PTSD, this can be helpful. Nightmares and other dreams occur during those same stages of sleep. By interrupting REM sleep, many of those dreams may not occur. Research into using a synthetic cannabinoid, like THC, but not the same, showed a significant decreasein the number of nightmares in patients with PTSD. Additionally, even if frequent use can be bad for sleep, marijuana may be a better sleep aid than some other substances that people use. Some of those, including medication and alcohol, may potentially have even worse effects on sleep, though more research is needed on the topic.
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