I did a lot of long drives between Kailua-Kona and Hilo after a long day working and one of the things I did to stay awake was listening to long-hair classical music.  The combination of not liking classical music and forcing myself to listen did something to keep my mind alert.  Problem was that only HPR played this kind of music and there was no reception from Waimea to Hilo.   I think having rest stops would help but that's another story because I learned the cost of building these stops is very expensive.