Moonlighting (2009)

Ernest 'Ernie' Niro, an eccentric costume apprentice has delusions of leading a double life. Documented by a camera crew, Ernie works in his Father's costume shop by day, and lives like an animal by night. With help from a paranormal expert, Ernie attempts to take control of his lucid blood lust and nightly debauchery.

Unfortunately the movie Moonlighting is not yet available on HBO Max.