Before I began to have full on meno symptoms I would need to pee every two hours at night. I could almost set my clock by it. I didn't realise it could be a meno symptom and told my doctor about it. She didn't seem too concerned, but sent me for a kidney and bladder ultrasound anyway, I think more to set my mind at rest rather than her own.
That's an ultrasound I would not like to experience again because you have drink a whole lot of water all at once a period of time before, then hold it while the ultrasound is done. Then you have to empty your bladder, and they will rescan so they can see how efficiently your bladder empties. All in all it's a very uncomfortable experience being poked and prodded while you're busting to go to the loo, but it showed no problems at all. It was only later on that I realised it was all meno related.
I've now been on HRT for years and I still need to go around 2am and then around 4-5am, but that's often when I wake up anyway, so I guess I'm only really going once through the night. I've done the drink more water during the day, and drink less water before bed and it makes absolutely no difference. It just is what it is. As long as I can go straight back to sleep it doesn't bother me how many times I have to go.