I'm going to be honest, I fall asleep during 99% of the interviews I conduct at work.
That doesn't sound good, why are you falling asleep like that at work?
I mean it hurts me to wake up. Often I don't even manage to finish the interview.
It is not good to be falling asleep at work. You should take a look at your sleep schedule and make good sleep a priority.
I don't think it's a big deal. I'm not paying attention at work anyways.
It is concerning to me that you think this is not a big deal. If the people you are interviewing complain to your boss, you could get in trouble or even lose your job. It would be wise for you to try to make working a priority over sleeping on the job, and get into better sleep habits at night.