The best replacement for nightmares is night terrors.

The best alternatives to nightmares are rated as following:
★★★★★  night terrors
★★  dreams
★  restaurant impossible
★  toys
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★  bad dreams
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★  dream
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  fairy tales
  hallucinations

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Speaking about nightmares, one probably shouldn't forget about ptsd.

Other search terms related to nightmares and their ratings are:
★★★★★ ptsd
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nightmares
night terrors
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