Hmmm, she wakes every 3-4 hours at night anyway. And when do late feeds I just put the TV on and no lights. I think she might be learning the difference between night and day. Can they at 3.5 weeks? Maybe i'll try when she sleeps through the night a bit longer. say 4-6 hours. Poor DH was stuck with her cranky mood last night. He fed her at 9:30 and she just wouldn't settle! She would drift off to sleep and then wake 10 minutes after, for hours. I am finding she fights till the death over sleeping! I just got her off to sleep now, but she will be due to feed in an hour anyway!