How and why do people have nightmares?
Nightmares occur often to relieve the subconscious mind of worry
or fear. They are often very realistic which makes them all the
more scary. This is the brains way of relieving a fearful
situation by bringing it to the conscious, at least temporarily,
and then letting you quickly forget it (usually). The mechanism is
believed to be the same as regular thought processes, which to a
large degree involve chemical movements within the nervous system.
You might try visiting your local or school library to find some
more information on this fascinating subject!
p.s. Thanks for using NEWTON!
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Update: June 2012