Little girl, lack of sleep won't make you fat, it will only make you have dark circles and bags under your eyes for a long time, so make sure you have a good sleep. If you are 14 years old, you should pay attention to your diet, don't overeat, and eat less puffed food, that is, snacks such as potato chips and shrimp strips! Eating too much will make you fat! Breakfast and dinner must be eaten. If you don't eat breakfast, you will gain weight. It is best to eat an apple every day and more cucumbers in summer, which is helpful for beauty. I hope my answer can help you and be adopted! thank you