the problem you are referring to called "Loss of Situational Awareness" and is a real problem among older pilots and as I learned much to my chagrin older motorcycle riders. While on a trip to Death Valley in March of 2011 with some friends,I ran into the back of a van. We were in heavy traffic going slow when something to my right distracted me for only an instant. When I looked back traffic had stopped. I grabbed the brakes but still slid into the rear of the van and then went down, totaling the 2008 RSTD I had waited and saved 12 years for. I was fine. Loss of Situational Awareness. I have since realized that I am not as aware of things as I used to be.I have now become more deliberate in my watching and riding. I drink more water,rest more, take more breaks, leave more space between the cars in front of me, ride a little slower. It can and will happen to all of us sooner or later. Keep yourself in as good a shape as you can, take your meds, get your rest, drink plenty of water and be aware.