I hear ya. Been there done that. In college, I worked full time third shift, 9pm to 6am, ROTC at 645-830, classes started at 9am and went until 3pm. I slept in my truck more than my apartment for those first 3 years. I can't do that stuff anymore. Found that out a couple months ago when I attempted a 17 hour drive thru the night, made it 13 hours before having to pull over and get a hotel at about 5 am in the morning