Which wall is better to be depressing, contained by the bedroom? I want to paint my bedroom but I would like one unlit...

I want to paint my bedroom but I would like one unlit wall. I would like to know, which wall should be pitch-black, the wall behind the bed or the wall around the skylight?
Answers:    behind the bed.
any or are fine, i chose behind the bed which looks pious.. unless u plan on moving your bed :S if u move furniture a lot.. i suggest the pane