Silence makes us uncomfortable because it feels as though someone is about to get bored of us. So we narrate, we thank, we ask if everything is fine, we explain that we are not usually like this. It is an old reflex: fill the air so as not to be a bother.
A body space is not giving you an oral exam. You can say nothing at all for an hour. And if you need to talk, that is fine too: there is no mysticism score you lose by mentioning that you are cold.