Amodern theory of dreams suggests that dreams us to fix the day's experiences into memories. this is known as the theory of dreams.

This is known as information processing of dreams.
According to this theory, Our brain provide us with several unprocessed stimuli that we got during the day.
The information process that happen based on those stimuli is what we've perceived as dream during the night.

In financial aspects, a depression is a sustained, long haul downturn in monetary movement in one or more economies. it is a more extreme monetary downturn than a recession, which is a slowdown in financial action through the span of a typical business cycle. a depression is an irregular and extreme type of recession. so depression is always followed by recession but it is not correct to state that a depression always follow a recession.