I just concentrate on what he is saying and it tends to keep me awake.
Although there has been a few times I fall directly into dream mode and I am in the middle of a dream while I am talking to him. I have gotten confused a few times where I would mention something that I "see" him doing and he usually has no idea what I am talking about to the point I wake up and I completely forget what I said.
There have also been times where I have felt I had this great insight and as soon as I open my eyes and sit up to tell him, it has completely escaped me. Very frustrating.
At least he is starting to recognize it and tells me to go to bed.