Exhausted...

I work some long hours. I get up at 3:30 in the morning, on the road by 4:30, and get to work by 6. I work 12 hours then come home. I sometimes feel like I don't have time to spend with my family and regret not being home on a regular basis, before dinner time that is. I get home and I just want to eat and go to sleep. Is that wrong of me? I really would like to spend more time with the wife and kids, but physically i'm beat! I should be working out, spending time with the family, etc.. but instead i'm wanting my bed. Any clue how to manage more time with the family?