Mercedes’ Attention Assist system alerts drivers when they are driving drowsy, and AOL Auto shares a firsthand account.

But about halfway home, she dozed off. It got a little quiet, and I cocked my head to the left. I didn’t feel sleepy, but about ten minutes later I noticed something on the dashboard: A coffee cup and the message, “Time For A Rest?” Huh? Is it telling me there is a Starbucks at the next rest-area? Some crazy ad inserted onto my dash?