I seriously question this kind of system. The Cadillac system seems to work by using IR light and cameras to make sure your eyes are open. I worked with a sys

I seriously question this kind of system. The Cadillac system seems to work by using IR light and cameras to make sure your eyes are open. I worked with a system like this many years ago in a transportation research firm. The way it worked was that it used bright IR LEDs at two different wavelengths, pointed at the driver's face, and then cameras tuned to both wavelengths, and then subtracting the images to see if the driver's eyes were open. I sat in front of this system some, but not for any long drives, and even then I felt very uncomfortable after 10 seconds or so. While humans can't directly see IR light, I definitely felt something there, probably from the very near-IR LEDs.