My usual stages of internal monologue during classical music performances when I don't know the pieces well:
1: this is so great. Why don't I do this once a week or at LEAST once a month?
2: [ruminations on performers' technical prowess, musicality, rhythmic integrity, showmanship]
3: so sleepy
4: [fighting sleep]
5: [asleep]
6: [awake with guilty start, pay rapt attention for remaining few minutes]
7: this is so great.
8: [as applause continues for fortieth straight minute] I want to go home.

Tonight, Evgeny Kissin & the NY Phil:

Nobody breathed.