That tip about coffee really is the best advice if you're struggling. I had decent luck finding coffee and barely ever needed to sleep. Once you're good and tweaked out, you can afford to be a little more liberal with the sprint button, too.
You can usually find tins of coffee within kitchens cabinets and sometimes in filing cabinets. I actually found quite a lot filed away in Carter Dam. You can sometimes strike caffeinated gold in the cargo containers on Timberwolf MT. Make sure you saw open any along your route.