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Although unpleasant, nightmares are essential to our dreams. Nightmares are a manifestation of other common feelings like stress and anxiety.

They aren't as straight forward as they seem, but there are several common nightmares most of us experience. Here are some common nightmares, and their potential meanings.

• Feeling Lost or Trapped: Feeling trapped or lost in a dream indicates a concern of being lost or trapped into a certain situation or position in your waking life.
• Natural or Manmade Disasters: Usually, a catastrophe dream alludes to feelings of disaster looming in your waking life.
• Car Trouble: Like dreams of a home, the appearance of the car represents your outward perceptions, and your inner feelings are represented by what's under the hood.

Full list at HowStuffWorks.com.

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