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Pressing on the chest changes the concentration of dissolved gasses in the blood stream. Your brain reacts due to excessive oxygen in the blood. This is oxygen toxicity. Why the brain generates vivid imagery when unconscious is a big topic. There's a theory that correlates dreams with a lack of cognitive stimulation. This is called autostimulation and may ...


I think this is mostly caused by hyperventilation. The excessive breathing disturbs the balance between CO$_{2}$ and oxygen in our lungs. This will cause a http://en.wikipedia.org/wiki/Respiratory_alkalosis (the blood pH, which is normally strictly regulated, gets higher), which can cause dizziness, headaches and fainting. The shift in pH can also disturb ...

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