Very little research into Sleep Apnea and snoring took place prior to 1975 but since then there has been dramatic increases in the amount studies, and as a result research papers, that relate to Sleep Apnea and Sleep Apneic Events.

The above graph shows the number of articles published on Sleep Apnea in 5 year increments over the period of 1971 to 2015.

The number of publications was obtained using the search engine Scopus (Elsevier Publishing Co.) and included all articles with the term “sleep apnea” in the title. The total number of articles for 2015 was estimated and based on data obtained through September of 2015.

 Source: http://www.sciencedirect.com/science/article/pii/S0273230016301842