I have been a member for a couple weeks that has included 2 weekends. I've noticed that the post trickle down on the weekend as people stray from their routines and then on Monday you get a ton of "weekend craving" post. I've come to the conclusion it is not cravings, it is lack of accountability.
Speaking for myself, I have a lot of extra time on my hands during the weekend and cravings sneak up on me -- especially if everyone else is doing it or no one is looking for my WI post :-)
Having said that, my observation has shown a pretty significant trend.
It may actually help a lot of people to log in on the weekends.
A "I'm sticking it out through the weekend" thread may be warranted.
Have a great day and a great week....and an even better weekend :-)