This is 100% true, I should know, I worked at Domino's delivering evenings as my second job. There was one time in my life I worked 3 jobs, that only lasted 3 months though, it was too much.
Worked day job till 5pm, Delivered Pizzas till midnight, started at 3am with my paper route till around 6am, got home showered and went to day job. Got free dinner at Dominos...Saved up enough to take my first wife to Europe for 2 week trip...
Oh, for anyone who did a paper route, it is 7 days a week, every blue moon you might could get someone to pick up your route if you wanted a day off. Day Job and Dominos was only during the week, so I caught up with my sleep on the weekends....Those were the days...