<s>[INST] I have a problem at night with pulling stuff out like bubble gum and it is a horrible feeling .I do this pretty often. Sometimes when I wake up my tongue feels like sand paper and a little swollen. I looked this morning and there were some black places on it. What do you think? I am actually not pulling nothing out but, it seems like it. [/INST] Hi..Thanks for the query..Your symptoms can be probably due to some sort of stress or psychological problems..Sand paper like feeling of tongue along with slight swelling and black spots can be due to mouth breathing habit that can cause dry mouth and black spots can be due to deposits of debris over the tongue..So my suggestion is to consult an Oral Physician and once get an oral examination done..If you have mouth breathing habit then you can follow a simple trick by pasting a vertical strip of micropore tape over the closed lips, but do only if you do not find it difficult to breathe through nose..Use a tongue scraper to clean your tongue daily and do warm saline gargles..Hope this helps..Regards.. </s>