Is there a chin strap on this cpap machine? My doctor just diagnosed me with sleep apnea, so I am going to be sleeping with one of these machines from now on. I have heard that the chin strap keeps it tight against your face much easier when rolling around at night. It's not the most comfortable thing to sleep with, but at least it keeps me healthy.http://www.cornermedical.com/product-category/chin-straps/