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You're referring to Postural Hypotension and yes -- that scenario is rare but can happen. The exact why of it is not always apparent, but I'd look to the basel-vegas berve plexus for possibilities. This type of passing out occurs mostly during play and doesn't happen with adults all that much ( as we -- sadly -- don't spend too much time on our heads). It's usually harmless, except you need to watch out for falling down and hurting yourself that way.

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