I've been thinking about this topic a lot recently. Even though my bedroom should be dark at night, it's often lit up like a Christmas Tree; the time light on the cable box, the "cable box is on" light, the TV light, the Internet flashing modem light, the house alarm light - all brightly lit. Some nights I have to get up and cover the lights with something just to get the room dark. It's definitely much better now that I no longer have a desktop in there too..LOL...
The problem is when I cover the TV light, the remote won't work. I use the time on the cable box. The alarm light lets me know the alarm is set, I do cover the modem lights so at least most of the strobe effect is gone.
What do you all do to get your room to a peaceful dark state?