Putting it Off Until Monday

Why is it you feel you have to weigh on the same day each week to see if you've lost any weight? I've never really understood that. Is it just something someone has come up with, or is there actually a logical explanation for it? I would be so happy if someone could tell me, and then I wouldn't have to pass my scales every morning wanting to hop on them. Crazy, I know, but I had much rather weigh each and everyday because it helps me to meet my goals.