Melatonin also works in low dose. You don't need the popular 3mg pills. After nearly 20 years as a night owl and struggling to retrain myself to sleep at night, I finally managed when I followed the advice from this article https://slatestarcodex.com/2018/07/10/melatonin-much-more-th.... Every night I'd take between 0.1mg and 0.3mg. It worked flawlessly for 3 weeks. I didn't experience any sort of adaptation. After 3 weeks I tried to stop. Although I could sleep well without it by then, I noticed that my night sleep was still too sensitive and prone to interruption, at the slightest disruption. I ended up taking it for 6 months. It never failed. I eventually managed a proper sleep without it and completely became a night sleeper.