How and why does the human body have dreams?
Dreams mainly occur in the rapid eye movement (REM) stage of sleep during which brain activity is high and resembles that of being awake.
The purpose of dreams are not fully understood, although they have been a topic of scientific, philosophical and religious interest through out recorded history.
There are many theories about why we dream, but no one knows for sure. Some researchers say dreams have no purpose or meaning and are nonsensical activities of the sleeping brain. Dreams are considered necessary for mental, emotional and physical health.
The length of a dream can vary. Dreams tend to last longer as the night progresses. The events in dreams are generally outside the control of the dreamer. Dreams can at times make a creative thought occur to the person or give a sense of inspiration.
It is unknown where in the brain dreams originate, if there is a single origin for dreams or if multiple portions of the brain are involved.