Speed keeps me awake. 85-90mph, yeah I know it's stupid but I know where I can do it and when. I rarely ever drive drowsy but when I start to feeling that way I just carve up some backroads and I'm good for a couple hours.

Speed makes the brain have to focus on the road instead of trodding along at the same mindless dull speed everyone else is going. It also makes you pay attention to whats going on, who is doing what and of course, to watch for police.

Now I'm not saying 85 or 90 through a city street or a crowded highway, there's a time and a place for everything and there aren't too many of both for that kind of stuff at 2am. It depends on the route too.