I was at the Are You Tough Enough event all day in the sun. I only rode one lap, slowly, just to check the course out but I was there virtually 12 hours from 8am and on the go all day helping out and chilling out. It was warm and sunny most of the time (Low 20s degrees) and I must have drunk 2 litres or more of fluids during the day and the same again in the evening, no alcohol at all.
This morning I feel rotten, like a hangover, despite over 7hrs sleep. (But I do have to get up early, 6.30am)