So I just laid down in bed and I got a sudden dizzy spell. I'm not one to get dizzy so my fiancé told me to get his mother to check my sugar and blood pressure. I can't remember what my sugar was but she said it was fine and my blood pressure was 100/68. I'll be 20 at the end of the year if that helps any. As I was typing this I shifted in bed and had an intense wave of dizziness that came from nowhere and it only happens when I'm lying down, never when I'm standing up. What could be going on?