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From: Causes of nite-time V-V
Do you feel you are overweight? Or do you havesleep apnea? You may be having apnea at night and not even know it. This will cause a decrease in oxygen to the brain and when you wake up, or get up suddenly, the lack of oxygen will cause the brain to say "whoa- lack of oxygen, time to shut down and reboot"- and you faint. Near syncope means your brain recovers in time, so you feel dizzy. Ever get up at night and feel woozy? It's the same thing. Lack of potassium, (salt), lack of fluids (water, Gatorade is better) , heavy drinking, drugs, all contribute to these symptoms. You have to figure out what your triggers are, and then take steps to change them.