i think it depends on the temperment of the baby. my first was textbook, and would sleep anytime, anywhere, no matter what. so i would put her in different places during the day. but at 3 weeks old, we were having some crazy nighttime crying in the bassinette, so off into her crib she went. what ended up happening (cause i didn't know any better) was she slept in the swing for her morning nap, her crib for her afternoon nap & nighttime, and her catnap anywhere (and that IS okay!). but, again, she was textbook, so it was okay.
now, with my second, he let me know in no uncertain terms that he was only sleeping in his crib (was out of the basinette in 2 weeks!). it was to be dark, and i was to have white noise. and eventually, life was much better for us all.
once i had him sorted out on night & day in general, he never had a problem distinguishing.
btw, both aluminum foil & posterboard are great cheap ways to cover windows. :wink:
HTH