How do you drivers do it?

How are you able to work a 12 hour resi route shift then come into work the next day ready to go? When I work a long shift (almost every day lately) it’s hard for me to come home and fall asleep within a few hours so I end up getting not enough sleep and feel completely wrecked the next day. I see so many guys at work who do long shifts everyday and they don’t seem to mind. What am I doing wrong?