I like to read my Kindle for a while after going to bed, just using the backlight only - I find this is sufficiently dark to trigger my sleep reflex, and it fee

I like to read my Kindle for a while after going to bed, just using the backlight only - I find this is sufficiently dark to trigger my sleep reflex, and it feels much more efficient to spend 20 minutes or so reading rather than lying in bed waiting for sleep.