Why does my 9-year-old wake up around 1-5 am already for weeks. she usually falls back asleep between 30 min-5 hours. sometimes stays up all night. she keeps waking me up and neither of us is getting enough sleep. how to deal with it? is it insomnia?

This is not normal and needs an evaluation by her doc. If it is not a physical ailment it could easily represent an emotional one. Either way there are steps that can be taken to work through this & eventually get everyone some sleep.

You may need to address her routine of activities and eating. Sleep hygiene: Visit this site for info on this topic https://www.cdc.gov/sleep/about_sleep/sleep_hygiene.html Wish you good health!