I had the same experience in CA. In my case the strip was made of divots indented in the edge of the asphalt. I was headed over a bluff when I woke up. What’s funny now is, as shocking as it was, it was nothing compared to the terror of the next 50 miles before I could find a place to get off the highway. I knew I wasn’t going to be able to stay awake but couldn’t stop. Kept having these “am I asleep again?” moments every 45 seconds or so. It was like some twisted Outer Limits episode. Never again will I knowingly drive exhausted.
Don’t know if it’s true for everybody, but one early warning of sleepiness behind the wheel for me is that I slowly begin to lose the ability to estimate the speed of traffic ahead of me, especially at night. Time to pull over and get out of the vehicle, walk around, get some fresh air.