sleeping or not!!!!

Hey ladies

I am on the expecting forum and havent had a need to come over to B&T before but I dont know what to do. My 18 month daughter has slept through the night since she was 6weeks old - she has woken once or twice when she has had a cold but that is it. She doesnt even wake up or make a fuss when her teeth are coming throuh!!!

Now she has decided that when it comes to bed time, at night or nap time in the day that she isnt going to sleep but just sit in her cotbed either crying or making whinging noises. This goes on for hours on end at night time and she has even started waking few times in the night. She normally only has 1 nap a day anyway but now I am struggling to get her to do that let alone sleep at night.

Can anyone help as to why the sudden change?

Zoe, Ellie and bean xxx