Sleep, for sure! Typically 9:30 pm - 6:30 am for the most part. I try to drink so much water, and plain water but my BUN is 30! I forgot to mention I also have nephrogenic diabetes insipidus with my PKD. A double whammy. But my nephrologist said the PKD is more serious. One of the reasons I really would like to see a Nephrologist at Mayo. I get mixed signals. When all the bloodwork and electrolytes are normal aren't my kidneys working pretty well? I was even congratulated by my PCP for having such good overall bloodwork! That pesky eGFR and creatinine level (1.9). My local Nephrologist says don't exercise too much before your blood test. Then he says to drink more water before your blood test. He's right b/c creatinine is directly affected by muscle. And BUN by dehydration. And creatinine levels seem to rise and fall. But I'm now considered 4th stage and that took me by surprise b/c I try so hard to be a good girl with my diet and intermittent eating habits. :))