Sleeping gone tits up - any ideas?!

[Scotinoz]

Hi,

My almost 20mth old used to sleep well. Half 7 until 6ish with a one decent nap. She had unsettled nights but nothing major and generally went down at night without drama. This was until her sister arrived three months ago...

She's not sleep through the night since

Posted too soon!

It's a battle to get her down. She wakes through the night - sometimes once, sometimes every couple of hours. She doesn't let my husband settle her any more. The moment she stirs, she stands up and screams.

We put it down to a phase, then an 18mth sleep regression, then something else but it's now been three months and it's killing us! Our 12wk sleeps better at night.

We've tried it all. Going in and cuddling her. Controlled crying. A bit of a bollocking (after two hours worth of farting about one night ). Bribery (too young to get it). She's not too hot, or cold, or thirsty, or hungry. We've swapped her sleeping bag for a duvet. But nothing works!

She has a bed, but sleeps no better in it or the cot (really need her out the cot for her sister to move in).

Any ideas gratefully received!!