Standing up suddenly causes tunnel vision?
Occasionally, when I stand up after laying flat on a bed or couch I will take a few steps and then start to have tunnel/ darkened vision, a slight headache, and sometimes lose some balance, once falling down and only keeping from hitting the ground by instinct, and then I forgot how I had left my bed for a few seconds.
While I am not to worried about this, I would like to know what might be causing this, so I can try to avoid a more serious accident. Could dehydration cause this? I have some friends who report similar experiences but others deny having them. Are some people more inclined to dizziness from this? I don't think it is from exertion or anything, as I am resonably get and recently completed a weeklong backpacking trip, although it is not something I usually do.
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When the human body goes from laying prone to standing up there is a rapid, and brief, change in blood pressure. This is the likely cause. Some people are more susceptible than others, and it's called orthostatic hypotension, or sometimes, "vertigo."
“He's Dizzy when he Stands Up.” An Introduction to Initial orthostatic Hypotension
Orthostatic hypotension
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