Nightmares?

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One of my 6-month olds has started having night terrors (or that's what it seems like to me). She never really wakes up but will cry and/or scream. Initially, she would let out a scream and go right back to sleep. It has become worse in the last few nights. I usually have to go in and soothe her back to sleep. Last night she did this 4 times, 3 of which I had to go into her room. Has anyone else experienced this?
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