My husband used to drink so much caffeine. Diet Coke instead of coffee.
Once he broke that habit. Switched to caffeine free Diet Coke after noon, it changed everything.
When he has caffeinated beverages, he can fall asleep but doesn’t stay asleep. Long periods of wakefulness in the middle of the night.
He had night sweats, those went away.
In short, caffeine was doing a number. Not in the way you might expect but in other ways.