The excitement with which you anticipated that event is carried over as the excitement you experience and the mind relates to that event. You may be excited, you may not be excited, the sun will still rise. If you were excited the excitement would continue after the sun rose. If you were not excited but calm that calmness would continue after the sun rose. The same thing happens at night.
Some people are afraid of the dark.
But whether they are afraid that the sun is going to set or whether they are happy the sun is still going to set. The setting of the sun has nothing to do with private whims and fancies but because these people work themselves up into this anxiety, when the sun sets, they collapse. Whatever happens in this world, whatever happens in life, will continue to happen and nothing will stop it. Into this dream of life we introduce all our fancies, fantasies and neuroses. Then, having introduced these fancies, we experience them as if they were somehow related to us so that even the arising or the cessation of an event was dependent upon our promptings.