I bolted out of bed yesterday because I was going to ride, got into the bathroom, and had to lie down on the floor because I was so dizzy that I couldn't stand up. Finally made my way back to the bed. No ride for me. I felt weird much of the day. My doctor said she thought I was dehydrated and told me to push the fluids. I had ridden the day before, mid-day in the humid heat. I guess I didn't drink enough. The message here is drink, drink, drink.