I've noticed that if I drink cold fluid before bed time, the next morning my stomach is upset. I was talking with a friend a few years older than me reported the same phenomenon.
I'm 49 and my friend is 53. Anyone in this age range notice the same thing?
Let's see, I'm 47 and every night before I go to bed I chug a cold glass of water mixed with two tablespoons of Metamucil. I have no stomach issues in the morning.