DD1 who is 3 years is rapidly becoming a complete nightmare. She's a dreadful sleeper, wakes at the slightest thing, won't settle herself back to sleep and screams and argues if you tell her to go back to sleep and keeps diving off her bed to run out the room and then wakes dd2 who is just a complete poppit! Last night, for example, she woke at 9pm, 12am, 1am and then was out of bed at 5am saying it was morning! Both dh and myself told her to go back to bed and she just went mental, kicking, screaming and shouting "NO"...what do you do? She is becoming increasingly rude during the day and always saying "No" to me e.g lets get you dressed....NO, lets have a bath....NO!! Everything is such an effort with her and i don't understand why, i'm a very patient placid person and my whole day revolves around fun things for the children so it can't be a feeling of lack of attention and i very rarely lose my temper or talk to her in a horrid way so why does she me? I tell her if i don't like her behaviour and i'm stern when i need to be but i'm not a shouter as i don't want her to behave simply because i've frightened her into it. I cannot continue on such little sleep and need some desperate advice on how to tackle this situation.