Have you ever had the experience where simply communicating with someone is so much work that you end up not speaking much of the time just because you don’t want to deal with the effort of it?  You find yourself silent a lot of the time or only speaking about nonsense that means not much in the scheme of things.  Then when you spend time with another person who isn’t so difficult to communicate with, it takes time to remember what it was like to have a conversation of any consequence, so you’re silent for a while.  But then once you get started you talk and talk and talk, as if you opened a dam letting the water move into the empty basin below.  Weird, these conversations that are too much effort.