DD will be 6 mos next week. We used the SleepEasy solution to sleep train and I wake her at 12am to feed her. She wakes daily between 440a-515a and will not go back to sleep. I try to let her fuss it out but she shares a room w/ my 3 year old and I'm afraid she'll wake her. This morning she got up at 440. I fed her and even though she was obviously tired (digging head into my shoulder after eating, etc) I put her back in the crib and she screamed so I picked her up at 510a. Any tips and tricks to get her to sleep later? She goes down between 630-645 each night and I don't want to put her down any earlier if possible and I don't want to keep her up bc that will probably have the reverse effect and disturb her nighttime sleep bc she'll be overtired- she can hardly keep her eyes open until 630 as it is. Thanks.