I hate turning on lights at night just to go to the bathroom. When I do it hurts my eyes, wakes up the babies, and I lose my night sight once the light is out and stub my toe. If I just walk in the dark I can see fine until I need to aim for something like the toilet. Here is an easy gravity switched LED that sticks to the lid and doesn't put out too much light but just enough for that 2-am run.
Need to salvage an 3V LED from a happy meal toy or something.
2 plastic soda bottle tops.
A 3V button cell battery, CR2032
A paper clip
Some double-sided foam tape.
And some solder.
Step 1: Cut Tops of Soda Bottles
Cut the caps of two bottles, make one slice very thin, the other about half way.