Sleep and weight loss

I've always heard that getting enough sleep is an important part of losing weight. Well, this week I think proves that. I have not gotten more than four hours of sleep a night for the past eight nights straight. I weigh myself daily and the scale will not budge below 240. If anything it seems to be going up a little bit. I have been sticking to the plan so well this week, I've been eating within my points and I have exercised every day. The scale should be trending downward but its not. I don't know why I haven't been sleeping well lately, you would think with all the exercise I have been doing I would be tired. I work all weekend after being off for nine days so I am hoping to get some good sleep in this week!