dentist. Got stuck in a traffic jam and had a hard time staying awake on the freeway. Finally got to the dentist office and fell asleep in the parking lot for a few minutes. I got up and went into the office, signed in and they took me back to the dental chair. I fell asleep immediately and woke up to a dentist telling me my root canal was over, but they couldn't let me leave until I could prove I could stay awake.