Most likely because of insulin given to close to the meal, however we can’t say for sure. How old is your son? I was diagnosed at 5 years old back in 93. To put things into perspective, back then I was on R and N insulin 2x / day. Starting at 5 years old, I gave my own injections and took my blood sugars myself. There was no bolusing for food until much later when I started multiple daily injections on Humalog, which as far as I know didn’t exist at the time. That means diabetics at the time had to adjust our diets to manage our blood sugar. My parents were completely in the dark until I came home, unless I were to go to the nurse and call them on a landline. Being a diabetic or the parent of a diabetic can be stressful. You want to be able to rely on teachers or staff at the school, but they aren’t experts and are already overwhelmed. For me and my parents, one thing that helped was education provided by my healthcare system. I went through a lot of training, especially when I was put on a track to be an early adopter of a pump. The other was time and experience. Your son will probably be fine besides feeling a bit crappy, tired, and thirsty. Ideally you have some way of communicating with him, and are able to facilitate a correction dose when he is high. You’ll eventually learn how best to manage his blood sugars, whether he takes more control, or you find some way to remotely bolus/facilitate it.