Did you want a serious response (I'm far too serious) - dear Farli??
Well I reckon it may not be dehydration that is causing you to feel dizzy when you lie down...that may be an ear infection or Menieres or some other unwanted phenomena.
Doesn't dehydration usually cause the reverse to happen? That is, it makes you dizzy (or a swimming head with or without palpitation) when you stand up after lying down - postural BP drop and feels bloomin' awful???
But what a great hypothesis as a launch for the rest of your message! Very funny!
