He thanked me, told me he knows others that need to read my book.

That indeed a great accomplishment as an author!! I hope that the guy gets some comfort or motivation or direction from your book!

!ALIVE

Waking up in the night to pee is quite troublesome! There are various reasons for that, including some disease conditions, notably DM, Overactive bladder, Urinary tract infection, prostate problems, etc. These conditions need to be managed accordingly.
However, some other factors could lead to nighttime peeing that can be avoided with simple measures. Some tips are here