AIrguy, usually I am in perpetual motion in the cockpit - aviate, navigate, communicate in an endless loop is how I roll. However, I sometimes fly over uninhabited desert for up to four hours in an LSA with no one to talk to and hear no one except the jets thirty thousand feet above me. Now lose your routine by troubleshooting a problem, add in some warmth and smooth air, maybe try some background music on the intercom and start dreaming Walter Mitty day dreams and........ it could be very embarrassing and it does happen regularly - to commercial pilots even.