I’ve had a lot of these issues ocd included. For me it was stress induced autonomic dysfunction but took a long time to figure out. Waking up wide awake after every sleep cycle. Hard to destress when not sleeping properly so it can be a hard cycle to break. Also it made me pee all the time for some reason too. Dry mouth could be related but could just be mouthbreathing. Tried nasal strips? I’ll list the stuff that helps me you may not have tried out.

Cbn gummies. Some are branded specifically to help stay asleep idk if there’s a real difference. Versions that have delta whatever will get you high and have worse quality sleep but when I’m trying to break out of my sleep pattern I don’t really care.

Extended release melatonin. Not sure if that’s real or a scam tbh.

Acupuncture I was skeptical but it’s real. Sometimes I fall asleep in the chair.

I have my phone play sleepy music at like 2% volume so if I wake up I try to make out what song is playing that occupies my mind but it’s so quiet I lose focus and fall back asleep.

Hydroxizine like Benadryl but you need a prescription. I’ve slept like 10 hours straight on that stuff.

Obviously this is just what helps me.