My dad is diabetic, has high blood pressure, congestive heart failure, and has been hospitalized for two strokes. Lately, when I got to visit him, he breaths heavily- while awake- and then produces a loud snoring sound that cause some of his body to tremble as well. It sounds just like a snore but he is not asleep.

Hey may be a shallow breather. I do this too sometimes because in the past I used to breath shallow and am still paying for it. Occasionally, I will suddenly take a deep breath with a snore coming as an effect of my deep breath.
Maybe he is catching his breath?
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YOU EXPECT ME TO KNOW!!?!?!?!?!?!?!!?!