WATCH: Driver Has No Idea He’s Narcoleptic, Falls Asleep and Crashes on the Road

While narcolepsy affects some 250,000 Americans, less than a quarter of those living with the chronic neurological disorder are ever actually diagnosed.

Narcolepsy is caused by a loss of the brain’s neurotransmitters that control our sleep-wake cycles. Often times, those that go¬†undiagnosed are mistaken for simply being lazy, or suffering from bipolar disorder, depression or epilepsy.

The guy in the shocking video above had no idea he had narcolepsy; that is, until his in-vehicle camera captured him falling asleep behind the wheel. Here’s what he wrote on the YouTube Post:

Previously unknown medical condition caused a crash on 4/2/2015. I have never passed out in 26 years, but suddenly passed out. I wasn’t tired, sleepy or anything like that. The last thing i remembered was turning off the cruise control, then I just passed out…

Thankfully, his car veered off the highway and into a field–avoiding injury himself or other drivers. We can’t say the same for his car, though.

There’s more to the story, and what happened afterward. You can read about that here.