9 month old waking at 3:30-4:00 am

Hello,

My daughter is just approaching 9 months she has been getting up every night between 3:30 and 4 am and staying awake for a hr. She knows how to self sooth, she puts herself to sleep and we try filling her up with as much food ( if she takes it) and milk as possible. She naps for 3-3h:15mins a