Pat doesn't fall asleep. lol Its a thing he does to see how you as a new instructor will handle a student who does something like falls asleep. (Fatigue, lack of interest etc etc)
Pat gives a fair checkride and yes he can be a hard ass, but he is fair.
I did my CFI Initial with him and aside from a helluva a long day (started at 0630 and ended around 2000) he covered all the areas in a fair manner.
The only "unfair" thing he tried on me was "stuck throttle" over the water off Palos Verdes. He snatched the POH (or what he thought was the POH) and put it down next to his left knee. A friend had educated me about this trick of his so I had planted a dummy POH within his reach and kept the real POH where only I could readily reach it.
After I pulled out the genuine POH and showed him the serial number matched the airplane, I taught him the supplemental water ditching procedure and then made it back to shore anyway.
At the end of the ride, he gave me a card with his email and home phone number on it. I hear he does that with all CFI Initials who pass. He also tried to hire me for his flight school before it was all said and done.

I like Pat. However, as others have said before me, if you know your stuff, you will be fine. If you don't...well.
Pat's fee back when I took his ride was I think 500. Its probably higher now though