I like to sleep in the dark. Even when I worked nights and had to sleep in the daytime, I wanted it dark in my bedroom. I bought "black out" blinds so no sun would get in. Now I have moved my computer and desk into the bedroom. Lately when I can't sleep, I notice that there are several "light emitting diodes"(LED) all over my room. They may be tiny little lights, but in the dark they can be very bright, especially if there are a lot of them.
Last night I took an assessment of all these lights. There is a light on the power buttons of the computer and the remote drive, a light on the keyboard and the speaker remote. There is a LED clock on the television tuner, and another alarm clock. The printer, the DVD stand-by, the TV stand-by, the telephone, the answering machine all have little lights! Even my electric toothbrush has a light on the charger! It is so bright in my bedroom that it is no wonder I was having trouble sleeping! Looking at all these lights made me realize that I had forgotten to plug in my camera battery. I got up to plug it in, it will glow orange until the battery is charged, then green!