Advice please! 2 1/2 year old suddenly has sleep problems...

[fringe]

Hi all,

Our 2 1/2 year old has always been a brilliant sleeper since she was tiny, however in the last couple weeks it has all changed. She now wakes up every night, sometimes at 11.30, sometimes a bit later and then gets out of her bed, and comes and knocks on our bedroom door. We quietly put her back in her bed and tell her to stay there but 5 minutes later she will be up and out of bed again. This will continue for nearly 4 hours. She has absolutely no problems getting off to sleep at 7pm, and has always slept with the light off and the door closed. When she moved to a bed from a cot 3 months ago there was no problem either. Having had a total of about 9 hours sleep in the past 3 nights I have spent today walking into walls and knocking things over. Anyone been through the same thing and have any tips on how to deal with it?

Thanks!