I've always been rubbish at drinking water but a couple of weeks ago started aiming for 1.2 litres a day (motivated by an app). In that time there have been 2 days when I didn't drink any in the morning, and both times I fell asleep after my lunch! I'm sure I've read along those lines before but experiencing it makes it so much more believable.
Another one is that weight training when I wake up makes me much more able to handle my temper getting the kids out of the house.
Anyone have any others?