It's a good idea in the daytime for babies to get used to light and get used to being up, that way they'll learn to sleep longer and better at night. Any baby will sleep in daylight if tired enough and black out blinds aren't going to change that. That's what I did and had great sleepers at night. Also having all the normal daylight noises is a good idea, washing machines, talking, radio, door bells etc. Certainly that worked for me. Tip toeing around in the day time seemed not to work for those who did it that I encountered.