London: Sarah Harding reveals she had an addiction for strong sleeping pills for four years. The 30-year-old singer said she has been to 'hell and back' with her alcoholism and dependence on prescription drug Zopiclone, which she started taking in 2006 after finding it difficult to sleep. It has taken her three weeks of intensive rehab to help break the habit.

“I'm just glad I survived. My drinking was out of control and I was addicted to sleeping pills (Zopiclone ). It was an awful combination,” a website quoted Harding as saying.