From the article: "A man driving a black Tesla through the parking lot appeared to fall asleep". "Appeared" is the key word here.
There are any number of medical conditions that could cause someone to briefly lose consciousness, including an epileptic seizure or a cardiac arrhythmia. It would be imprudent to leap to the conclusion that the driver was so tired that they went to sleep while driving. That is only one possible explanation, and in this particular scenario, one of the less likely.
I say less likely because the photo in the article shows the Tesla front end on top of the hood of another car. That seems unlikely to occur unless the Tesla driver's foot was pressing down firmly on the "go pedal", causing the car to accelerate. If the driver simply "dozed off" their body would have relaxed.
The article quotes the fire department chief as saying "The car apparently jerked, went up over the curb and rode up over the parked car". So "jerked" could be interpreted as "accelerated" with enough speed to cause the Tesla to literally ride up onto the hood of another car. That's not possible if the Tesla was moving at slow speed in the parking lot where the accident took place.