RE: How dark do you keep your baby's room during the daytime?
You may find that your baby becomes less of a deep sleeper when she gets a bit older. Many babies lose that ability to sleep through bedlam after a few months.
That being said, I don't do anything special to keep it dark in Sarah's room. We have wood blinds, but I have many times forgotten to close them. I haven't found that the degree of ambient light affects her ability to sleep. But other stimulation definitely keeps her from sleeping now that she is older.
HTH,
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)