Founded in 2003, Global Sleep is a network of sleep disorder diagnostic testing facilities. Based in Houston, Texas, the centers specialize in diagnosing obstructive sleep apnea (OSA). The firm operates more than 19 locations throughout Texas and Oklahoma. Global Sleep renders continuous positive airway pressure (CPAP) therapy as well as provides medications, such as Vivactil (protriptyline), nasal decongestants, aminophylline and others. In addition, it performs a variety of surgeries, including nasal surgery, nasal septoplasty, removal of nasal polyps, hyoid suspension and sliding osteotomy, to name a few.