Children of routine

My girls or children of routine. Once their routines get off a bit, they really don't do well. Maddy has not been in a routine since right before Christmas and I can tell. She has been off schedule with her eating and sleeping. Instead of sleeping at 9:30 pm, she's been up til 11:00 pm. Ugh. That is so hard to handle when I've been used to her going to bed at a decent time.