I have an Oura ring and got it because I had a sense my deep sleep was terrible. I would often wake up at night and wake up with a headache in the morning as I often stay up late and often would not get enough sleep. Found that magnesium personally helped me incredibly. I now sleep through the night, feels like my sleep is much deeper, etc., and my Oura stats show likewise.
Still the other most important thing is to just go to bed on time. If I jump on my computer before bed I almost always get stuck and go to bed way too late. Hard habit to change but essential.
Supplement right before bed. This stuff is so individualized/your mileage may vary so need to try and see what works for you but I used to do a basic magnesium citrate supplement and now do a triple mag blend with glycinate, malate, taurate.
Still the other most important thing is to just go to bed on time. If I jump on my computer before bed I almost always get stuck and go to bed way too late. Hard habit to change but essential.