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Dizziness is generally relieved, not exacerbated, by lying down. However, if you have a condition called benign paroxysmal positional vertigo, you are going to battle dizziness while lying in bed. (BananaStock/BananaStock/Getty Images).
Other things that may cause it: lying down for a long time or being dehydrated. Thatâs why itâs common to feel dizzy or lightheaded when you stand up while youâre exercising, or after you stagger out of bed when youâre sick with the flu, says Dr. Gibbons. Usually the dizziness only lasts for a few seconds before it subsides. Thatâs totally normal and nothing to worry about.