I had a dream. (Full)

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Originally Posted by OBW

Found the reference. Ecclesiastes 5:7. It appears most likely that this is referring to thoughts and imaginations rather than to the workings of the brain during sleep.

5:3 For a dream cometh through the multitude of business;

"multitude of business" can also be translated through much effort, or much labor.

I think that this definitely conveys the sense of dream as in the phrase "my dream is to be a doctor". However, there is a famous story regarding a dream being the breakthrough that led to the discovery of the DNA structure, ultimately resulting in a Nobel Prize. History has other anecdotal stories like this. So it seems that if you spend months focused on a particular problem it is quite likely that a dream may come through all of that effort.