Las Vegas maniac Stephen Paddock showed signs he was crazy — such as lying in bed and screaming​,​ “Oh my God” — his girlfriend told investigators, according to a new report.

Longtime gal pal Marilou Danley revealed that Paddock “would lie in bed, just moaning and screaming, ‘Oh my God,'” according to an NBC News report citing former FBI officials briefed on the matter.

Danley also said Paddock showed “mental health symptoms,” one of the unnamed officials said.

Investigators are struggling to figure out why Paddock, 64, went on the deadly spree that killed 58 and injured nearly 500 others.

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