You could do that Eye-Bo marathon thing I do where the right half of your screen is occupied by an Eye-Bo video (preferably a constant version) on repeat and the other half reserved for whatever it is you do on the computer. Then, when you plan to go to bed or do something else in your room that doesn't involve the computer, you can easily switch the video to fullscreen, and then back to windowed mode when you're done. This, of course, has the implication that your room is non-lit, with your screen being the only source of light.