This article reviews how the upper airway anatomy influences the pathophysiology of obstructive sleep apnea (OSA), and the pertinent anatomy.
Anatomy and physiology of obstructive sleep apnoea

The Journal of the Laser and Health Academy published a clinical study which showed the Er:YAG laser snoring treatment was a safe method to reduce the severity of snoring and sleep apnoea, with 74% of people in the trial stating their snoring improved after the treatment.
Nonsurgical Minimally Invasive Er:YAG Laser Snoring Treatment

A clinical study conducted by the University Clinic of Respiratory and Allergic Diseases in Slovenia showed that the Er:YAG laser treatment reduces the amplitude of snoring by 30%.
New Laser Treatment Method for the Reduction of Snoring and Sleep Apnoea

Patients found the severity of their snoring had been reduced by 62% after completing two sessions of the Er:YAG laser treatment.
Laser-Assisted Snoring and Apnoea Reduction, 9 Months of Experience