I have a student in my class that hums ALL the time. The humming is so loud and distracting that it not only distracts the other kids in my class but it also distracts me. His mom is asking me for suggestions to curb the humming. She said that the humming actually helps him to focus (which I haven't noticed it helping him focus but maybe his mom sees something that I don't see), but she also understands that it can be very distracting. I'm not sure what to tell her. I can't really think of anything that could take the place of humming to help him focus. Any ideas?