So I have a 6 year old daughter and my son is almost 3, we are currently in a two bed house and my son has been in a travel cot in my room or sharing my bed since he was a baby but last night I decided he was old enough to go into the bottom bunk with my daughter in her room. No issues with him at all, he doesn't get out and slept through the night and til a later time in the morning which is amazing, the one issue I'm having is when I put them to bed my daughter is constantly trying to chat to him or shouting for me to tell on him or complain about something he's done. Tonight she decided she wanted him to borrow one of her teddy's to sleep with and then about half an hour into bed time when he would usually be asleep she has changed her mind and started shouting and screaming and having a tantrum that she wants the teddy back, she is now playing really loudly with her toys and refusing to go to sleep. She never usually does this and it's really winding me up as my youngest is usually asleep the second his head hits the pillow and she is keeping him up misbehaving. It's not fair on him at all but he needed to make the transition into a bed at some point and once they are asleep then it's completely fine, I spoke to her before bed about making sure she is quiet and thinking about her brother when she goes to bed, I don't know if she is doing it because she doesn't like the change but I think that's very unlikely because she was so excited when I told her they would be in the same room. What can I do about this? How to I show her that her behaviour is very unfair towards her brother? She did the same last night also and had a meltdown about something else he was doing, it's driving me mad and it's only night two, maybe she just needs time to get used to the transition and I'm being too harsh on her? I'm just not sure