I've been this way since teenage years -- very light sleep, once I wake up its hard to go back to sleep, and I've had long periods where I could not fall asleep

I've been this way since teenage years -- very light sleep, once I wake up its hard to go back to sleep, and I've had long periods where I could not fall asleep for hours. It was all related to stress and anxiety and perhaps lower natural melatonin production. 300 mcg of melatonin helps tremendously with falling asleep, and after a week or so of usage, I find I no longer need it, I can fall asleep naturally until the next bout of anxiety/anger/depression. I know antihistamines help me stay asleep, but I try to stay away from them. What I've found works great for staying asleep is reducing stress and anxiety, no stimulants (after having COVID-19 I quit all stimulants because I haven't had my heart checked yet).