Any idea?

[Whompt]

Randomly? Hmm... I still think it's a blood rush. Like, nearly certain. You have to be at the point of dehydration for water to affect you so adversely. Though, I suppose it's entirely possible. I read something once about people who would be anemic during the winter months from lack of sunlight. Maybe that's it too. I dunno why it happens, but apparently it's a medically tested condition.