Yeah you're right
I noticed that big amount of creatine after workout with no water enough lead to painful cramps in the middle of the night.
So I reduce the amount of creatine for my PWO shake and no creatine after. I don't drink too much on night 'cause I don't want to wake up in the middle of the night.
Otherwise, I wake up my wife 'cause I piss or I have a painful cramp