My dd is 5 months old and has slept 12 hours at night since about 3 months. For the past month or so, she wakes up about 30 minutes after going to sleep and cries. She will do this on and off until about 9pm when she will sleep soundly for the rest of the night. I am totally confused as to why this is happening. She cries so hard it is heartbreaking. I have tried pat/sush and this works but then 5 minutes later she is waking up crying again. During the day she is a contented happy baby and hardly cries, but for these couple of hours at night, she changes! Can anyone suggest a reason and possible solution? I seem to spend my evenings up and down the stairs every 5 mintues!!!! :?