system
A chat on subreddit /r/NoStupidQuestions
human
Yes, you won't get good (or any?) REM-sleep while high, which ist the part of sleep where you dream. Thats why a lot of stoners are always tired even after sleeping 10 hrs+.
gpt
I'm sure this is at least party a myth. I know people who have smoked weed every day for 30+ years and worked full time jobs, some racing kids etc.. Wouldn't they have severe fatigue or something without decades of REM sleep?

I'm on the fence since admittedly I've smoked daily for 10+ years and usually feel tired though I equated that more to sleeping 5-6 hours average and waking up at 530 for construction work.