I definitely agree that cannabinoids mess the sleep processes, but without cannabinoids at night (even during periods when I'm not adapted to them) I wake up easily 6+ times during the night just to urinate. Its a horrible experience that's easily solved with cannabinoids, but there are likely other solutions to whatever is actually causing the problem. I do stop or slow my water intake a while before bed but this doesn't seem to matter.

Also it should be noted that this is not the primary reason for my cannabinoid use.

It is possible that cannabinoids help with this because it changes the way you breathe - deeper and more active breaths in lower part of the stomach will help to relax bladder and the urge will be much softer. Abs training may help as well like knee raises while hanging on a bar.

It takes weeks after I stop smoking weed for me to start remembering my dreams again. I don't doubt that there are other effects on sleep from acute smoking around bed time. But for me, the loss of REM sleep is definitely mainly a function of cannabanoid tolerance.

After many years of on and off heavy smoking, I would say that the best best practice is actually not smoking weed every day. I think there are some amazing benefits to weed, but for me they all but disappear with enough tolerance.

I’ll take slightly impaired sleep over morbid nightmares and waking up multiple times a night from dying in them.

Citations? From what I know cannabis can give you really good "deep sleep." Which is just as good as REM sleep.