Why is it that i can drink water all day and not have to empty my bladder till i go to bed at night?

Bladder emptying: 1) you retain fluids; 2) you have a large capacity bladder; 3) you are an infrequent voider; you may have a sensory deficit or neurogenic bladder. You should start a voiding diary and placed yourself on a routine voiding schedule whether you have the sensation to void or not. You should have an evaluation before you develop problems.