My father who is not overweight had a sleep apnea problem all his life because he has over skin in his troat which was preventing him to breathe proprely when he was sleeping. He was awaking almost every minute to catch his breath. He was sleeping between 4-5 hours per night and he aged really fast. He decided to go to a sleep clinic and the doctor prescribed him a machine that he had to sleep with every night to help him to breath well. Since then he sleep like a baby and he look better and more healthy.
I hope I help you a bite.
Did you see a doctor from a sleep clinic? Did you get the diagnosis for sleep apnea? It might help you.