For some people, improving (reducing) CO2 levels in the bedroom might be low hanging fruit. Ever since moving to a new place with a controlled ventilation system, I had no dream recall, and often suffered from incredible fatigue and tiredness. I suspect that I was low on REM phases, but never got a sleep study done. Finally, I started opening the sleeping room window ever so slightly, by turning the window handle a bit to the open position. We also started changing the air filter of the ventilation system more often, as air flow becomes noticeably weaker after ~3-4 weeks. As a result, I often dream now, and wake well rested most of the time. For me, air flow has proven more important than blue light reduction, or weight loss.