@ Gratia. I was in your exact situation a couple of years ago. Getting up 2-4 times per night. I don't know if you can get the major relief I got from a couple of minor changes:
1. I stopped giving my husband liquids 3 hours before going to bed.
2. I started giving him his night time pills with ice cream instead of water.
.
It was fantastic. Suddenly he was sleeping through the night or waking once. And the big additional benefit was that he woke up much less confused and in a better mood! I was not the only one experiencing the effects of those bad, broken up sleep patterns. He was too!

We have stayed with that schedule. Over time as he became incontinent, we moved from underpants to diapers at night. We put on two and put a "guard" in the inside one too. I can check on him once before I go to bed and remove only the guard, and, if necessary, the inner diaper if they are wet.

Wishing you well!