true!! so bloody true!!
Most of my working career I worked 7 12 hour days, plus I'd be on call for any emergency that might come up. My longest hitch was 15 months without a day off. I did this for close to 20 years. My wife still works 7 12's, usually for 3-5 weeks straight then she's home for 2-3 weeks.
You do what you have to do in order to get ahead in life. Now days I can sleep in most days until 5 am, and stay up as late as 9 pm.
My sleep schedule is opposite most folks. I go to sleep at 2 a.m., get up about 11:30 a.m. . I have been a night person all my life and worked day shift most of my life. I would have loved working a graveyard (12 to 8 a.m.) shift but that was not meant to be. I am the night guard that won't fall asleep on watch. I also have very good night vision. Except for the blood sucking part, I would have made a good vampire. LOL