Tart cherry juice is said to help but the tartness may wake you up too much.
Sticking with non-medicinal options per the OPs request, but have you considered a sleep mask?
I bring it up because one of the things that keeps me up when I wake up during the night is the habit of looking at the clock to figure out when I have to get up again. Which triggers more thinking about the next day, which brings about more adrenaline, which . . . and then I have to wait until the actual exhaustion brings me back down, in a similar 30-60 minute timeframe.
At first, I just went with a non-lit clock option (many out there), but I also found that I’d still look for the clock and start wondering what time it was… not much improvement. Wearing the mask reminds me to not do so and better yet, especially in the post DLS time portion of the year, helps kill the visual cues of light leaking in through the windows.
And, if like myself, you also have issues falling asleep, you can go for a bluetooth enabled nightmask and listen to white noise / quiet music / etc without bothering anyone else who may be in the room with you. My wife falls asleep easily and tends to sleep like a brick when we aren’t blessed with cats in the bed.
Have you tried the Golf channel?
Ha, ha. That would definitely put me to sleep. I tried a white noise app last night and it definitely helped. I also ordered some L-Tryptophan. So hopefully they will both let me fall back to sleep faster. Time will tell.