Strange Facts About Dreams - Something Everyone Should Know.
A dream is an image of a person's wishes, desires, fear and troubles, it occurs involuntarily in mind.
It also occurs in various stages of sleep, the purpose of which is not yet completely understood and is in research and interest of various scientists and neurologists.
It mainly occur in the stage known as rapid-eye movement (REM) when brain activity is high and resembles that of being awake. This stage of REM sleep is revealed by continuous movements of the eyes during sleep.
A dream may last a few seconds or approximately 20–30 minutes. These dreams tend to be much less vivid or memorable.
In order to learn more about dreams, please watch the short video as it's highly recommended.