I think it really depends.
The research is mixed on this. Some say open up the blinds, keep a lot of light in the room during the day. Others say keep the room dark.
Spirited/Touchy babies prefer a dark room; it's easier for them to sleep in. Textbook and easy babies I think can go either way. If you want to keep the room dark, be sure to open the blinds and keep the house bright when it's time to wake up. Make a production out of it if you want, but at night, keep things very low key and calm, barely any talking, dark rooms, as little light as possible when you feed. You'll want to keep things low key right before naps too. Eventually I think he/she'll get the idea.
Hope this helps!
*HUGS*
Sonya =P