Alec Baldwin realized he was an alcoholic when he found himself drinking wine while driving at 4pm in the afternoon.

The actor began boozing heavily when his acting career took off in his early 20s, and the habit soon took a grip on his life. He reveals he would regularly party all night, drinking and snorting cocaine, and then spend hours obsessively playing video games in an arcade before he could sleep.

Baldwin makes the revelation in Christopher Kennedy Lawford's new book Moments of Clarity, in which a group of celebrities discuss their addictions and how they turned their lives around.

The 30 Rock star writes, "I would play video games from 9am to 11am, and I would wind down. I'm driving down the road, I'm having a drink, its 4 o clock; I'm supposed to have a drink. But one day I went, 'I don't see anybody else in their car with a plastic takeout container filled with ice and wine. They're drinking coffee and they're drinking diet coke. They're not drinking wine'."

Six weeks before his 27th birthday, Baldwin joined a support group, and kicked the addiction for good. He adds, "God got me sober. That day God was a black, 65-year-old retired postal worker named Lenny. Lenny said, you never have to feel this way again if you don't want to."

Moments of Clarity also features contributions from Tom Arnold and Jamie Lee Curtis.

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