Foundation year：1991

    Webpage：www.apsono.com

    Number of members：254

    Composition of members (degree， specialties， subspecialties， etc.)：Pneumologists：21，1%， Psychiatrists：18，6%， Neurologists：12，7%， Psychologists：5，9%， Pediatricians：4，6%， ENT：4，2%， Dentistry：1，3%， Other Medical specialities：4，6%， Technicians：21.9%， Engineers：2.1%， Other occupations：3%

    Historical perspective of the society：The Portuguese Sleep Association (APS) was created in 21-10-1991 to promote research ......