I know exactly what you mean. I work 45-50 hours a week and when I get home at night I just want to crash. Wish I could retire. I find that working in my sewing room for an hour really relaxes me. I usually do my cutting in the evenings and sewing on the weekends.
Also remember, quilting should be relaxing not stressful. Don't stress so much on the little things and just relax.