We were doing great with a 8:00-8:30 bedtime, and now all of a sudden for the past week, she won't go to sleep any earlier than 9:00.-9:30 I've tried more naps, less naps, shorter naps, longer naps. baths, earlier bedtime and nothing is working. I don't know what changed to make her start going to sleep later. The only thing I can think of is the day I started Keflex for mastitis all this started, but I know thats kind of a long shot. Can I get her back to our earlier bedtime, or is this just her body's natural cycle?