Can u work for 12 hours a day? then play for 12 hours?

Dont know if its the cookies or water in Amarilla,TX, stomachache in the night and didn't sleep well.
Sometimes I feel tired on the way, but thinking still got so many things to do, and by telling myself "hold on", "come on", then later on I may forget about the tired. Finally, I drove for 12 hours. If I can't drive for 8 hours, then how can I work for 8 hours? If I can't work for 8 hours a day, then what can I do everyday? Sleeping? Can I play games for 12 hours a day? Well, may be that s how i convince my body to keep working and awake, not to waste more time