“God, this movie is so, so filthy. One of the more infamous unrated gore films released in the wake of Romero's DAWN OF THE DEAD, NIGHTMARES... is the kind of film tailor-made to get shredded to ribbons by trigger-happy censorship boards. Could the controversy possibly have started with the grisly original release marketing campaign, asking theater patrons to guess the weight of a brain floating in a jar of liquid?
A mental patient named George suffers from horrible nightmares, including a hell of a curtain raiser involving a severed woman's head in his bed. After undergoing experimental treatment, he's unleashed into the public and naturally goes on a slashing rampage, stalking a young single mom and her kids -- setting the stage for an insane home invasion showdown.
The gore scenes here are routine showstoppers, and the sex couldn't be more unsavory (including a pivotal kinky flashback no viewer has ever forgotten), but running interference is a hefty vein of unintentional comedy thanks to Italian-born director Romano Scavolini's odd view of American culture.” (Nathaniel Thompson, Mondo Digital)