I do the Body Test on the Wii Fit every morning so I more or less know how much I weigh every day, but my 'official' weigh in day is every Wednesday - just because I started SF on a Wednesday. I do it at around 6 in the morning because I have to do it before I go to work, but if i'm off I like to do it around 11ish, it seems to give the best results, haha