Do you prefer to sleep with some amount of light, or in complete darkness?
There's really no downside when you can use echolocation anyways.
I prefer to sleep in complete darkness.
I prefer sleeping with little red light, but my father says I need to be sleeping in complete darkness to get all the benefits of a good sleeping.
I usually turn off all kind of lights to sleep.
But every night, just before I sleep, I love to use my laptop or phone, so I put it in f-lux, while I read a ebook or watch a video.
Edit: please f-lux team add more options of intensity to Android app. Thank you!
the dark music too !!