By Breaking Celebrity News Staff

Best known for his uncanny impersonations of Bill Clinton, Al Gore and [expletive] Cheney, Saturday Night Live star Darrell Hammond has revealed the dark truth behind his comedy persona, Breaking Celebrity News has learned.

The funny man details his downward spiral in a disturbing new tell-all book in which he relates how he drank and did cocaine while with the show and was once taken from NBC “in a straitjacket," reported the New York Post.

“I kept a pint of Remy in my desk at work,” Hammond revealed in his memoir God, If You’re Not Up There, I’m F**ked, that will be published on November 8.

Hammond claims his boozing and drug-taking was self-medication to escape from painful childhood memories that still haunt the 56-year-old SNL star.

“The drinking calmed my nerves and quieted the disturbing images that sprang into my head ... when drinking didn’t work, I cut myself," he said.

In 1998, he got so wasted that cops were called to take Hammond from the NBC infirmary to New York Hospital in a straitjacket. “My wife came but I didn’t recognize her,” he wrote.

Three years later he added cocaine to his recreational resume and started taking an "obscene amount" of the drug during binges.

During his 14th season on SNL in 2009 Hammond, who had already done one stint in rehab, relapsed heavily and found himself in a Harlem crack house on numerous occasions. “I had the brilliant idea I should try crack,” he recalled.