Why do I get a wave of dizziness when standing up after I lay down?

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Its not that bad, and it used to be worse since even just sitting and then standing up quickly caused me to be dizzy, but for some reason its gotten a lot better. Now its only if I lay down for over 10 minutes but its still annoying. I have a normal blood pressure and everything so I don't know what's causing this?
Why do I get a wave of dizziness when standing up after I lay down?
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