Potentially dangerous
It barely went around my neck was one problem (no, my neck isn't abnormally large). In addition, when inflated,  there was definitely pressure on the carotid arteries.  That by itself is very concerning but, adding the idea of sleeping with this collar on is...  Well,  let's just say that it would be unwise.  If you have sleep apnea,  I would think you would be in real trouble.<br />I suppose it did serve as a cheap and quick thing to see if I would invest the money in an expensive device.<br />Get a used one if you can, it was probably used for only a few minutes.
Rating: 2 stars