Have you ever noticed how much you have to pee in the morning?
Internist Dr. Keri Peterson says that’s because, overnight, our kidneys filter less urine. Plus, at night our body releases more vasopressin - a hormone that makes us hold onto excess fluid. So, by morning, your bladder’s full and you’ve gotta go. Then, if you immediately drink coffee or tea, it has a diuretic effect, sending you to the bathroom again.