To address this, I've tried a couple of different things to help sleep: melatonin; and valerian root extract.
The valerian root worked great, until one night it gave me the worst sleep paralysis night terror of all time. Sleep paralysis is nothing new to me. Getting it once every other month or so, it's a bit unpleasant, but far from terrifying. Sometimes I can even leverage it to induce a lucid dream. But this was on a whole other level, with a full blown out-of-body hallucination and a demonic face across room that locked me in a state of raw horror and doom. Also, it made me feel mildly hung-over in the morning.
Never taking that stuff again!
Melatonin on the other hand, perfectly fine. I take a 3mg supplement with L-Theanine 1 hr before I want to sleep. Makes me nice and drowsy, and I sleep like a baby through the night. Can't speak to how it affects dreams because I have dreams every night anyway even without it. But overall really good experience.