Help ! Sleep regression !

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Hello mommies ! My daughter is 7 months old, sleeping great until six months with us in our bedroom. We switched her to her room since a month and since a week she’s been sleeping from 7.30 pm to midnight and then waking up every 1 hour and staying awake 2 hours screaming. What is it ? What to do ? Teeth? I’m tired, my husband is tired. What to do ! Thanks (she had a little eczema that we are treating also)