I went to the dentist this morning. My gum needs to be treated so I went to the dentist. Actually, it is supposed to do 4th treatment. When I got there, one of the assistants led me to the seat. I sat down and waited for the dentist. There was a TV monitor just in front of me. I watched it without any sound (they turn off the sound, we can just watch it)for a while, wating and waiting. At one point, I fell a short sleep. When I woke up surprisingly, it had passed 50minutes already! Oh no. I was quite upset because no one let me know or gave me any notice that my turn would be late. I tried to calm down and said I would come back next week because I had to get home by 10. They said sorry again and again. Back home, I thought that I was upset because my turn was too late but what made me more annoyed is they just let me stay on the chair like that. Did they let me alone because I fell a sleep? I think they should have told me something even theyhad to wake me up. Importantly, I didn't fall a deep sleep. I just dozed off. Who can sleep deep at the dentist?