Frequent urination post prostatectomy

Hi guys... lots of info here on peeing a lot at night post prostate removal... question is, why am I peeing all night and all morning, a lot, when I stop drinking water at 4:00 in the afternoon? (drink one quart a day) I seem to pee out the days liquid by early evening, but it starts up at night, getting up about 5 times all night, then a big kidney dump all morning till about 9am. This seems to me to be more of a kidney dump issue than a prostate surgery issue... maybe there's a medication to calm down the dump?? I need more sleep