Are there any natural ways that can treat sleep apnea?

Natural vs ?????: Talk to a sleep dentist or physician about therapy. Osa is primarily an anatomical disorder. Treatment can include weight loss, physical or air-splinting of the airway. All methods seek to prevent collapse of the airway during sleep (like a straw stuck in a thick milkshake). Central apnea may respond to medications--very few though so talk to your doc about your specific diagnosis.

Some helpful hints: There are things that can be done to help lessen symptoms and depending on severity, may eliminate them. Weight loss, avoidance of sedating chemicals or medications, avoiding supine sleep can help. There is an oral device that a dentist can make and some medical therapies from an ENT that can help. Pap therapy is still the gold standard treatment and splints the airways open.