Sounds emerge from darkness

It's funny how sounds become louder in the darkness.  Often, I turn on relaxing music to listen to as I get ready for bed and then as I fall asleep.  I set it for a comfortable volume while I'm getting ready for bed, and then as soon as I turn out the light to go to sleep, I want to turn down the volume.  That one I've been aware of for a long time, but today I noticed a new one.  I tried eating by candlelight, with the lights off, and I found that suddenly, I could hear the crickets.  Usually I notice them when I'm on my balcony, but not when I'm indoors.