Auto manufacturers are approaching Adaptive Cruise Control in a manner that intermingles the two: GM "Super Cruise", Ford's upcoming "CoPilot 360 Active", etc.

In my opinion, these two features are very related. In order to have a reasonably low false positive, the sleep detection must be reasonably lenient. In turn, this means the vehicle must be able to (most of the time) tolerate a few seconds of inattentive driving.