My 8 motnh old has been a pretty great sleeper, in the last couple of months she has woken every 3rd night or so and will easily go back to sleep having had a feed. However she has now become a monster and refuses to go back to sleep at whatever time she wakes. I have tried feeding her, rocking her and even bringing her into our bed (this never failed before) however to no avail. SO I am now trying controlled crying but it's hell! On the first night she finally fell asleep after 2 hours, then 2nd night after 1hr 45, last night we had no issues and tonight she has just started. The problem seems to be that she gets SO angry she thrashes around the cot. Is this normal and something I should persist with? Or is there something I have missed?