It's okay when you happen to fall asleep. I'm gone moments after I hear Paul's voice, which is why I "answer the questions" before I push the play button.
It is best to listen to both at the same time, allowing the messages to come in. Go with the flow and the rhythm of the voices and float between the voices. If you find yourself listening to one ear or another, do what it is saying until you can float down the middle again.
