Ha! I remember one night about 12 miles in. I'm sleeping soundly and my wife wakes me up:

"Wake up. I think I hear a bear over there..."

I listen for a minute and reassure her. She promptly goes back to sleep.

I spend the rest of the night listening for bears over by our bear can...
Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963