I know where you are coming from. I work a full time job, belong to two quilt guilds and take martial arts 3-4 times a week. That doesn't leave a lot of time for quilting in the evenings, plus sometimes I am just too tired. I try to save Sundays as MY day - to do anything I want - not need to do. I usually spend it in my sewing room. Sometimes I sew, sometimes I clean and sometimes I just putter around.
Don't make yourself feel like there is this giant, looming project in your sewing room. Just go in there and decide what you would ENJOY doing and have fun with it. Maybe you spend 15 minutes before you start sewing to do some cleaning. If you do this each time, your room will be cleaned up and organized before you know it. That's what I am going to do, as I have been trying to go through all my fabric and get it bolted up and organized for a while now.
Best of luck to you!