How can I get dd2 to sleep?

[ShinyAndNew]

She used to be a good little sleeper. But the last few weeks with her have been hell.

She is put to bed at 8pm with dd1. She gets back up constantly, screaming bloody murder when she is sent back. Which wakes up dd1. This goes on untill 10:30pm if we are lucky, but often lasts untill untill midnight or later.

Every night at between 3am and 5am she starts crying and screaming and comes running into our bed. She goes straight back to sleep, between me and DH, but she likes to sleep diagonally, across the bed. So she is often the only one who gets back to sleep.

If we move her back to her own room, she wakes the entire house with banshee like howling.

Dd1 has not been to school on time, consistantly for weeks, because she is just so tired on the mornings because of dd2 waking her up throughout the night, everything seems to take forever.

Dd2 is 2.7.

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Hi, is she having night terrors or nightmares? Can she tell you why she is crying? My ds (just turned 3) has been doing similar things for months and I think it was usually a nightmare. Could even have been night terrors as he often could not talk, would just look terrified and keep crying and screaming for ages. Usually happened more when he was overtired. It still happens some nights and dh goes in to sleep with him in his bed. (I have baby dd with me)
Sorry, nothing much helpful to add...

I think it could be night terrors/nightmares. She is not very verbal yet, and much of what she does say is incomprehensible to anyone but dd1. She won't talk at all except to screech no, when she is crying and seems to not remember it the morning after.

Could you try getting into bed with her, rather than bringing her through to your room? Then when she's asleep, you can creep back to your own bed and hopefully get some sleep. This is DH's MoA with 3yo DD2 (though he often just falls asleep in her bed with her till morning - he could sleep on a knife's edge, that man!).