About three years ago, I fell asleep while driving. I went of the road at about 100 KPH after grazing another vehicle and taking out a sign. Fortunately I wasn't hurt. The first thing I did, after calling my insurance agent and a lawyer (I was charged with Dangerous Driving) was to see my doctor. He sent me to a sleep testing centre.
Turned out my apnoea was "severe', more than thirty-five arousals per hour. (That doesn't mean what it did when I was seventeen.) I've been using the CPAP pretty regularly since. Now it's down to two. I still haven't killed myself driving - as a matter of fact, I got off the DD charge.
Sounds like you might have sleep apnoea alright. See a doctor if you need confirmation. Here it was free (covered) with a referral from my doctor.