Waking at 3 am habit

Anyone else have a baby who does this? She wakes at 3 am every night. I honestly don’t mind getting up with her but omg it takes anywhere from an hour-2 hours to get her back down every night so we are both losing that amount of sleep each night. I’m soooo over it. Any suggestions on how to break the habit? She settles herself to sleep so please don’t suggest that.