Keeping her full

Samantha

My 18 month daughter used to sleep so well throughout the night, maybe getting up once to eat. For the past month or so, she's been getting up two-three times and has a whole 8oz bottle every time. We have tried giving her oatmeal before bed to keep her full, but that doesn't seem to work anymore. Are there any tricks or suggestions of foods that we can give her to keep her fuller for longer? Thanks!