Weekends

Once again, it's Saturday night, and I realize I have done absolutely nothing today. Why is it that 9 out of 10 of my weekends are completely useless. I start out with the best of intentions, to catch up from my busy week, and all I end up doing is sleeping and watching tv. Why is this? I am a driven person, and I have so much to do...why am I such a lazy ass on the weekend?