No, you don’t feel like you can’t breathe. You feel sleepy because your brain starts to shut down. Your heart slows because it’s the most oxygen consuming organ in the body and without enough oxygen it can’t work. As you drift to sleep, your heart fails, and so do your other organs. By the time this is impactful, you’re already unconscious. You die in your sleep. Other than the “feeling of impending doom” it’s probably one of the most peaceful ways to go.
Better than a pulmonary embolism, which DOES feel like you can’t breathe.
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