DD is 18 months old and we have been having a few sleep issues recently, but this one is really starting to get to me!!!

I put her down in her cot in her room at about 7.30pm and when she wakes up at about 1am ish i bring her in with us, give her a feed and she rolls over and sleeps till 5am, when we feed and snooze for another hour.
NOW i bring her in at 1am and its PARTAY TIME!! I feed her and she will just have a big feed, then be up and ready for action...DP and I are essentially asleep so she will sit on our heads, climb all over us, kiss us...which is cute, talk to herself - loudly - shout ''mummy mummy mummy mummy MUMMY' then when no one gets up she starts crying, its pretty much a fake cry but it so loud! I try talking to her, feeding her again, which shuts her up for a bit ( ) but this goes on for litterally HOURS!! And i cant sleep properly when im feeding her and she doesnt want to feed all night anyway. Eventually she falls asleep again at about 4.30am but still wakes up before 6am. This has been going on for about 5 days!

So, i rambeling (very tired) but what im getting at is....what the heck is going on!?! What do i do. SHe doesnt seem in pain or anything like that. is this one of those wonder weeks!? or her age? or should i stop bringing her in with us (note:we are getting a big bed for her in her room in about 2 weeks, maybe this will help?)

Any help/advice much appreciated!!!!!! TIA