Adding a light in lower bunk?

[DirtSquirt]

Has anyone added a light to a lower bunk? Specifically on a Rockwood Roo 23RS or even a 21RS as I am sure they are similar. Any ideas how I could go about doing this? If I knew where the wires ran for the light in the upper bunk, I could run off of that. Or maybe the bathroom light?

[updhaul]

We added "puck"lights to avoid rewire mess with good results and 3 aa batteries