Difficulty sleeping through the night

I just found this group and I don't see my issue in the threads. I simply have trouble sleeping at night. I'll lay in bed for an hour or so and then get up and sit for a while, perhaps have a warm glass of milk, and go back to bed. The next time I get up will usually be in a couple of hours and I'll realize that I must have slept during some of that time but it doesn't seem like it. I'll either get up and read or just go back and lay down again and keep cycling this way. I have a sleep tracker on my watch which I know is not accurate but I believe it can indicate trends. It rarely shows more than 4 or 5 hours of sleep, almost none deep REM. Lately it hasn't been able to record any sleep at all. The funny thing is that I don't feel super tired during the day (yet). This has been going on for a month now. Before that, I had taken small puffs of marijuana at night which just did the trick, but I know that putting smoke in my lungs is not a desirable solution, so I visited a sleep coach at the Rochester Mayo last month and was given a method of preparation and diet to follow as well as being encouraged to keep a log. I expected difficulty to begin with because I had been using weed for a couple of years. Things just never improved though. I'm pretty sure I don't have sleep apnea. My wife doesn't notice me snoring or gasping. No wonder. I'm not really sleeping most of the time. I'm beginning to wonder if maybe I just don't need much sleep anymore at the age of 76. That just doesn't make sense to me.
I'm just wondering if anyone else has experienced this kind of problem. I've tried off the shelf sleep aids including hops and valerian and some other elixirs but have noticed absolutely no difference with them. If anyone had a similar issue, how do you approach it? Maybe it's a non-issue and we are supposed to have this occur in our later years.