Could Tiredness Along With Difficulty In Breathing Be Due To Clogged Arteries?

Feeling sluggish and tired a lot. Welsh ennui get up and move around I feel better . My wife tells me I hold my breath when I sleep. I guess it could be that I m not getting enough oxygen We eat healthy. I exercise most days. I am overweight but have no problem pushing 50 pound weights for 20 minutes and walking in a treadmill for 45 minutes at least 5 days a week. I m 68 Could my arteries be clogged?