Why do my left hand feel stiff?

Well, I was playing down in bed playing a game on my iphone, when my veins constricted to the point where I was barely able to see them when my left hand. My hand was too stiff that it's kind of difficult moving my left hand. Is my hand stiff due to the lack of blood circulation through my veins? If so any know a remedy to have veins dilated.

I'm so sorry but when I read your question I thought so wrong and dirty like lmfao but anyways umm I have no clue just try to keep moving your hand and try to get blood circulated

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