For days after 911, most air traffic was grounded. I was acutely aware of the resulting quiet — and very appreciative of it. I think we subject ourselves to stress in countless ways every day, including noise, particularly from air traffic. We’re fools, killing ourselves with indifference to our environment. That indifference is profitable to many, so go back to sleep. Perhaps a pill will help. There’s another to perk you up in the morning.