We've got the same problem with our 3 year old. We have just moved over here, so all a bit unsettling for her, but then again she hasn't slept well since her little brother was born...er, a year ago!

The last few nights I've been telling her she can have a little chocolate the next day if she sleeps in her bed all night and if she doesn't come in to wake up Mummy and Daddy. It seems to be working quite well, so fingers crossed.

At the end of the day there is no simple answer to this. 3 is still a very young age and they still need comfort.