Answer:
He would wake up from sleeping in his nest
Step-by-step explanation:
after he wake up he'd go through the pipes in the the school cafeteria to look for a feast. He finds some bread and he starts going crazy with it. But out of the blue the staff members of the lunch room see him and smack him with a spatula and he runs back to his hole with crumbs still on his fur. He goes back into hiding as it is not safe to come outside right now and he should probably expand his home into something bigger. Maybe the principals office. Theres tons of food in there. Meanwhile the mouse just rests in his nest waiting for the school day to end to get to work.