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Sleep position affects the severity and occurrence of these complications, and positional therapy is one of the less invasive treatments to deal with them. Sleep positions can be self-reported, which is unreliable, or determined by using specific devices, such as polysomnography, polygraphy or cameras, that can be expensive and difficult to employ at home. The aim of this study is to determine how smartphones could be used to monitor and treat sleep position at home. We divided our research into three tasks: (1) develop an Android smartphone application (\u2018SleepPos\u2019 app) which monitors angle-based high-resolution sleep position and allows to simultaneously apply positional treatment; (2) test the smartphone application at home coupled with a pulse oximeter; and (3) explore the potential of this tool to detect the positional occurrence of desaturation events. The results show how the \u2018SleepPos\u2019 app successfully determined the sleep position and revealed positional patterns of occurrence of desaturation events. The \u2018SleepPos\u2019 app also succeeded in applying positional therapy and preventing the subjects from sleeping in the supine sleep position. This study demonstrates how smartphones are capable of reliably monitoring high-resolution sleep position and provide useful clinical information about the positional occurrence of desaturation events.<\/jats:p>","DOI":"10.3390\/s21134531","type":"journal-article","created":{"date-parts":[[2021,7,1]],"date-time":"2021-07-01T12:03:27Z","timestamp":1625141007000},"page":"4531","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["SleepPos App: An Automated Smartphone Application for Angle Based High Resolution Sleep Position Monitoring and Treatment"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0281-9023","authenticated-orcid":false,"given":"Ignasi","family":"Ferrer-Lluis","sequence":"first","affiliation":[{"name":"Institute for Bioengineering of Catalonia (IBEC), Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain"},{"name":"Centro de Investigaci\u00f3n Biom\u00e9dica en Red de Bioingenier\u00eda, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain"},{"name":"Department of Automatic Control (ESAII), Universitat Polit\u00e8cnica de Catalunya-Barcelona Tech (UPC), 08028 Barcelona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7493-1268","authenticated-orcid":false,"given":"Yolanda","family":"Castillo-Escario","sequence":"additional","affiliation":[{"name":"Institute for Bioengineering of Catalonia (IBEC), Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain"},{"name":"Centro de Investigaci\u00f3n Biom\u00e9dica en Red de Bioingenier\u00eda, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain"},{"name":"Department of Automatic Control (ESAII), Universitat Polit\u00e8cnica de Catalunya-Barcelona Tech (UPC), 08028 Barcelona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Josep Maria","family":"Montserrat","sequence":"additional","affiliation":[{"name":"Sleep Lab, Pneumology Service, Hospital Cl\u00ednic de Barcelona, 08036 Barcelona, Spain"},{"name":"Centro de Investigaci\u00f3n Biom\u00e9dica en Red de Enfermedades Respiratorias (CIBERES), 28029 Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6541-8729","authenticated-orcid":false,"given":"Raimon","family":"Jan\u00e9","sequence":"additional","affiliation":[{"name":"Institute for Bioengineering of Catalonia (IBEC), Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain"},{"name":"Centro de Investigaci\u00f3n Biom\u00e9dica en Red de Bioingenier\u00eda, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain"},{"name":"Department of Automatic Control (ESAII), Universitat Polit\u00e8cnica de Catalunya-Barcelona Tech (UPC), 08028 Barcelona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,1]]},"reference":[{"key":"ref_1","first-page":"614","article-title":"An overview of sleep and common sleep problems","volume":"24","author":"Lee","year":"1997","journal-title":"ANNA J."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"vii","DOI":"10.1016\/B978-0-444-52006-7.00047-2","article-title":"We spend about one-third of our life either sleeping or attempting to do so","volume":"98","author":"Aminoff","year":"2011","journal-title":"Handb. 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