I have a wonderful baby girl who used to sleep through all night. Over the past few months though she has been waking quite regularly at around 10.30pm. She screams and sits up and takes AGES to re-settle (usually between 1-3hrs). She is not cold, wet, hungry/thirsty (refuses the bottle and once back asleep doesn't stir again until around 7am) etc. She has one day nap for around 2 hrs and goes to bed at night at around 7.30pm. At both sleep times she hardly needs anything at all to get herself to sleep (yes, I am VERY lucky). I just put her in her sleeping bag, sing a little song and put her in the cot. She sometimes makes a little protest cry for about 10 seconds but usually is completely silent! I have tried everything at night from rocking, cuddling, cry-it-out (I am not good at this... 15 mins is all I usually get to), patting etc but she still wakes. What's going on at night????