Off-task non-disruptive behavior may look like:
Spend a lot of time looking through things, desk, backpack, etc.
Quietly blend in while doing nothing, doodling, or appearing to work
Say they are getting to the task or are working on something and produce few results
Day dream, look out window, around the room, look past the teacher, at other students, stare, etc.
Sleep
If this sounds like your student, click the function or reason behind the behavior: