Don't forget about humidification, If you wake up with dry mouth, a CPAP machine can also help with that. Having a dry mouth causes all sorts of other crap as well. It makes it easier to get sick, and can cause issues with your teeth as well.
So is dropping your bedroom temperature.
Our bodies drop temperature before sleep to signal sleep as well, and the timing of that seems to be important to consider when sleeping.
I find this so annoying because I notice. Oh shit I'm cold, it's that time of night my body temperature is dropping and I'm definitely not going to be in bed in the next 15 minutes. And then I'm awake for the next 5 hours and have terrible sleep because I missed my window.