my daughter 2 year and 7 month old some times at night start crying badly during sleep and wakes up but didnot stop crying.she call me mama mama and when i hold her she never stops crying like she has very pain in body.then she want to go to her father but didnt stop crying.we offer many things but she did not want to take anything at that time we ask about pain but she didnt reply just crying badly.we ask from her that are you scared?but she doesnt respond.after 15 to 30 mins or more she stop by itself and sleep.it happens almost every month.i am worried about her.is this normal or not?