[HoMiPa]

I pick up a few packs of glow bracelets from Dollar Tree - 4 bracelets in a pack, for $1 per pack. Snap one of those, hang it in the bathroom, or wherever else you need dim light, and toss them in the morning. No need to remember to turn something off, which is what I would fail to do. You can buy the color you want based on how bright they are (for instance, the blue don't emit as much light as the yellow).