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I find sleep changes really noticeable, so so everyone else. Dreams become very vivid for couple of days to a point of discomfort.

When you smoke i never dream. When you stop body overcompensates.

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I wonder if it's suppressing REM sleep like alcohol does

It does. My understanding is that THC inhibits REM sleep, and as a result the chemicals that are usually released during the REM phase that cause you to dream do not get released. Once you quit and start having REM sleep again, there's a "backlog" so to speak of the chemicals and more than usual are released, thus causing the extremely vivid dreams.

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