OKLAHOMA CITY — Graymark Healthcare has acquired somniCare and somniTech from Avastra USA, a division of Avastra Sleep Centres Limited. The Somni companies, based in Overland Park, Kan., operate sleep disorder testing and treatment centers in Kansas, Nebraska, Iowa, Missouri, South Dakota and Minnesota. Steven Hull, MD, will continue as president of Somni, and the companies will continue to operate under the somniCare and somniTech names.

Graymark is a diversified medical holdling company that owns and operates diagnostic sleep centers, independent pharmacies and a durable medical equipment company. "Somni's regional presence complements our Sleep Disorder Centers' existing geographic markets, expending our growing national footprint of best-in-class sleep centers," Stanton Nelson, Graymark CEO, said in a release.