I fluctuate anywhere between 2-4 lbs. overnight. I weigh just before bed to give me an idea of what to expect the next day.

Weighing at night does not give a true measure- IMHO. There's too many variables that can throw it off-- food intake, water consumed, working out, etc. I may weigh every day, even twice a day, but I only record my weigh-in from Sunday mornings.

HTH-
Nikki