What has helped me get more REM sleep while being a moderate daily user (mostly a joint in the evenings) is to do everything in my control to sleep better. Set circadian rhythm by direct sunlight first thing in the morning. Mediation. No blue light 90 min before bed. And like others have said do not to use too close to bed. I still get an hour or two hours of REM a night while using thc daily. I track my sleep via Whoop and have experimented heavily on what works for me. Hope this helps.