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"Most of us have four or five REM sleep episodes where we have movie-like dreams with narratives,” psychologist Paul Glovinsky, Ph.D said.

While most of us are spectators in our dreams, there are a select few who can direct their dreams, they are called lucid dreamers.

"For some people the part of the mind is more executive. It could be some of the frontal lobe, the planning is still able to put its two cents into the dream where others can't," Glovinksy said.

Why do we remember some dreams and not others?

"We usually remember the ones we wake up in REM sleep or just coming out of REM sleep, which is very common,” Glovinsky said.

Some experts believe there is nothing random when it comes to who is in our dreams or what we dream about."

A bad dream occasionally is not uncommon. But some populations, like war vets, can have reoccurring nightmares and if not managed properly, can disturb a peaceful sleep. This can sometimes go on for years.

You can put an end to nightmares by using a technique called a technical rehearsal. Create a peaceful ending to the bad dream by writing it out and rehearsing it several times, using imagery.