What is the only effective countermeasure when a driver experiences acute, overwhelming drowsiness and microsleep symptoms while driving?

1. Open a window and continue until the planned fuel stop because fresh air reliably prevents microsleep
2. Drinking energy drinks and continuing to drive for another 300 km
3. Stop immediately in a safe parking area, drink a caffeinated beverage, and take a 15-to-20-minute power nap (Kurzschlaf)
4. Rely on lane-departure warning to keep driving until the destination