Sometimes I've heard somebody try to preach a sermon through what they are praying, like they are making pointed comments in their prayer that seem directed at the people listening instead of directed at God.
If I'm not praying myself, I listen in. You never know what you'll learn by paying attention to your surroundings. If it is just somebody going on and on, I tune it out and think about something else.
If you fall asleep before somebody gets done praying, either you are in a pentecostal prayer meeting or maybe you might have diabetes, falling asleep so easy like that.