Sleeping position, energy levels and stuttering

Usually, I used to sleep face down and stomach down. I used to get snoring also. Yesterday afternoon I slept for 2 hours. During that sleep, I slept face up and face side only and not face down. After waking up, I found that my energy level was little up and my speech was more fluent without gasping for breath. Less vocal blocks too.

Then, later on the night also, I slept in the face up and side mode and little face down (Could not get sleep with face up and side positions. Could go to sleep faster if I lie face down. I think this is mostly of a habituation. I need to change this habit voluntarily and firmly). Today morning, I see my voice was little louder and speech was more fluent without gasping for breath.

The underlying principle here could be lack of oxygen during sleeping because of sleeping position. I have protruding tummy which gets compressed while lying face down. This may exert compression pressure on my internal organs such as kidney and adrenals. Also, it may cause less expansion-compression of diaphragm which may result in less oxygen intake and more accumulation of carbon dioxide inside the body. I also have snoring. So, it is possible that I may have sleep apnea. I am not sure whether I have sleep apnea or not. I need to check that. Sleep apnea may cause all the symptoms currently I am experiencing.