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American Nightmare is a hardcore punk / post-hardcore band from Boston in Massachusetts, formed in 1999.
In 2003 and subject to a legal challenge from a similarly named band from Philadelphia, American Nightmare changed its name briefly to the initials "A.N.", then to American Nothing for a brief period.
After the other American Nightmare threatened to file suit again, the band changed its name to Give Up The Ghost (which was intended to be the name of their second album).
http://www.metalmusicarchives.com/artist/give-up-the-ghost
The band broke up in 2004 but regrouped later under the American Nightmare name.
https://instagram.com/weareamericannightmare/