I weigh myself every morning and sometimes when I get home from work. Sometimes during the day too.
I'm not sure why I'm bothering to respond to this, but, listen up diapergirl, the human bodies weight naturally fluctuates 1-3+ pounds over the course of a day. Sometimes more. You are at your naturally lightest in the morning after waking up, with an empty stomach, night clothes and an empty bladder and bowel. I trust you are weighing yourself without your diaper.
So then you put on clothes, eat, drink, walk and move around, your muscles build up lactic acids and other muscle waste products. By the end of the day, you are heavier, add the weight of your clothes, your diaper, glasses and everything else and you will be heavier by the days end. Then you go to bed and your body does it's natural thing while you sleep, you wake up, void and VOILA, you are lesser in weight. And the cycle begins again. Such is the wonders of life.