For me is helping l-theanine, GABA, chamomile (extract) capsule, or you can try skullcap lateriflora, tart cherry,.... Not only the relaxing herbs but liver herbs can improve the sleep quality and deep sleep (there are liver mixes with milk thistle, turmeric, NAC, ALA,...). You can try to detox or take liver herbs during the day, or you can try some liver supplements in the evening (but be aware that some herbs can be diuretic like dandelion, so don't take it before sleeping; there is a good chance that you will wake up because you have to pee).
I had a very bad sleep quality because of lyme disease and now it's improved (more then 1u30 deep sleep, i also can check it with the smartwatch)