Am I the only one here who actually likes it dark? It might be healthier with natural light, but my personal preferences has always been darkness. I wonder if it is related to coming from a northern country (Scandinavia) where ~1/4 of the year is really dark.
I would guess that all Scandinavia countries have similar rules, and there's actually a minimum amount of light you're legally allowed to have in a room. The law in Denmark for instance actually require a room to be insanely bright.