One time, tears ago, I was walking in the hall of a large government office building in DC. I said hello to the cleaning lady. She asked how I was. I said that I wished it was the weekend. She said to be careful about wishing my life away. I was stunned. I was also very young, so it was a great lesson to get from a stranger.
That said, find meaning in what you do on the weekends, reinvent the job as someone above suggested, be even more compassionate to your colleagues than before.
This past weekend, I made cards for returning soldiers. I am still feeling the happiness about that, now, on Monday.
Also, do something really nice for yourself every morning. My spouse has been getting up early to work on a personal project. I am going to join him and get up at 6 and work on my idea from 6-7. I am going to see what happens by giving myself this time. You don't have to do the same thing. The idea is to find something that makes you look forward to the day. If the answer is getting up earlier to have some time for yourself before your work day starts, then that might solve your problem.