Boredom, Decisions, Stalling
When a listener uses his hand to support his head it's a good sign boredom is setting it. It starts with the chin being supports by the thumb then the fist and usually ends with the head fully supported by the hand.
Drumming fingers of tapping foot are signs of impatience.
Chin stroking happens when a listener is going making a decision. The gesture after the chin stroking will tell you whether their decision is negative or positive. Leaning back and crossing arms and legs is negative. Leaning forward with arms open is positive.
Someone who wears glasses may take them off and put one arm in their mouth.