Speaker
Get some dance curtains that will keep ambient light out of your bedroom. Not little thin, gauzy, filmy things that will let in a lot of light, even from a brightly shining moon. I mean, I've had my bedroom illuminated by bright moonlight before, so much that I could read a book. Don't, I mean, don't go to sleep with the television, the computer, the tablet, or the phone glowing in your room. Make your sleeping quarters, whatever they may be,