Devices are sold to attach to variously fueled smokers to maintain the temperature.
I have two sizes of Weber bullet smokers. Don’t use them anymore. Yes, I had to stay up a lot to keep the temps good overnight. They DO sell aftermarket temperature controllers for these. But I moved on.
Then I bought an electric smoker, and an aftermarket PID temperature controller. Then I started using the Webers for 2-3 hours to get a smoke ring, then put the meat in the electric smoker for overnight. No temperature worries. The electric has a tray for wood, but I get better smoke rings from the Webers.
THEN I bought a Kamado Joe ceramic (love it) and aftermarket temperature controller. I keeps temps better, and uses less charcoal and wood chunks. Puts out a great smoke ring. AND I can crank it up to 550-600 for making pizzas! Really GOOD pizzas. Can’t stand to get take out or frozen anymore. The last good pizza parlor around here must have lost their cook, because it ain’t worth eating anymore.