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@Canaidan
Assuming that you are a fit young guy who is eating enough and doesnt have any chest pain there arent too many things that could be causing this besides simply not drinking enough fluids leading to hypovolaemia (i.e. not enough blood circulating and pooling in your legs when you stand up essentially robbing blood from your brain)....
In the words of my school rugby coah, "pee clear!!"
(Alcohol will actually worsen this as it has a diuretic effect after a couple of pints...)