I have a five month old and we put her to bed at night at about 6:30 ish. she falls asleep very fast and we notice that in the past 2 weeks she is waking up screaming after 1/2 hour and it takes another 2 hours to get her to sleep. Then she is not going to sleep until 8:30 or so. this is too late for her and it is messing up her pattern. what do I do? I tis almost like she is sleeping but screaming at the same time.