The study duration with each patient will be 48 hours (two nights); at the first night the sleep study will be with PAT device, with snoring recording and without the "Forrest" epic device. In the second night the sleep study will be with PAT device, with snoring recording and with the "Forrest" epic device. The order of the sleep studies (with and without the epic device) will be randomly determined by computerized ahead prepared list. The research duration for patients that did not have a sleep study over the last year, will take place for 3 nights; the sleep study will be performed in order to make sure the patient does not suffer from obstructive respiratory disorder during sleep. The sleep studies will take place in a sleep laboratory (Millennium Sleep Labs LTD, Beer Sheva) or as an ambulatory study, at home.