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Yes as a matter of fact.. when you hold your breath for longer time your brain starts becoming hypoxic and you start feeling sleepy and eventually pass out.. but that's how far your brain allows you to go voluntarily.. After this your brain takes over and starts breathing while you are unconscious. Views Â· View Upvotes.
By Mayo Clinic Staff. Few sensations are as frightening as not being able to get enough air. Shortness of breath â known medically as dyspnea â is often described as an intense tightening in the chest, air hunger or a feeling of suffocation. Very strenuous exercise, extreme temperatures, massive obesity and high altitude all can cause shortness of breath in a healthy person.