Yoga is not a sport, is a path to God. A path to illumination.
I believe u need to learn to relax ur mind and body, thats all.
When u come home from job, go to the park, take walk, try to catch all things arround you. Listen the wind, enjoy the sun rays, listen the birds song, try to feel the nature. Buy something u like, be a kid again.
Because of our jobs, sometime we are very tense, so we need to do things which we like very much.
Mental relaxation is good for mind, and for sleep also, and physical relaxation is for body.
Try to find joy and happiness all around you.