*sighs*

It is impossible to gain a pound over night unless you consumed a zillion and a half calories yesterday.

Your pound gain is only water. You drink 4 to 10 pounds of water a day....that is NOT including the food you ate. 1 gallon equals little over 8 pounds.

Try to relax and stay off the scale. If you do chose to weigh every single day, go for the averaging method to save your sanity.