Shuji steals a pillow from Togusa's bed and takes a nap on the floor. It's not the most comfortable place to sleep, and he does wake up earlier than normal, but this way he'll know if Togusa gets up in the middle of the night.

Or if Daisuke tries to get him up. Shuji picks Daisuke up as soon as he can and carries him to the kitchen. He'll feed you breakfast, so don't bother Dad, okay?

...He just has to find the dog food first, but it can't be that hard to locate.