What is the lag time between event and acknowlegement?

While dozing off on the train recently, I started dreaming that the train was nearing the edge of a cliff. Suddenly, the train jolted in the manner that trains usually jolt when ';changing lanes.'; In my dream, however, I felt the train make a fluid transition over the edge and, at the same time as the jolt, crashed in the canyon.

My question is: How did I know ';beforehand'; to start dreaming about the train going over the cliff? Did it all occur simultaneously? (How bizarre!!)

Similar events occur in mornings when I dream that someone is yelling at me to get out of bed just moments before the phone rings.

Are there any books or study reports available on the subject.What is the lag time between event and acknowlegement?
Since neither the train nor the alarm are controlled by your dreams, the dream has accomodated the event after the fact. The dream ';explains'; the external event. Faster than thought.

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