are nightmares real or they are only state of mind?

nightmare - an old and famous nightmare painting
July 1, 2007 12:06pm CST
most of humans experince a nightmare. german has named it as alptraum. the name elf come from alp. nightmares are mythical and they have a scientific explanation . but it feel so real if you experienced.i know nightmare is not real but i can t belive it.what is your opinion?
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