Actor Matthew Perry has given an in-depth interview to People magazine about how his sobriety and helping others to stay sober has allowed him to find "true happiness".

Perry tells People: "I had a big problem with alcohol and pills and I couldn't stop. Eventually things got so bad that I couldn't hide it, and then everybody knew."

Of achieving sobriety, he says: "Something clicked. You have to want the help."

Perry has since turned his former Malibu home into a sober living facility called Perry House and has become an advocate for drug courts where non-violent substance abusers receive treatment rather than prison terms.

"The interesting reason that I can be so helpful to people now is that I screwed up so often," he says. "It's nice for people to see that somebody who once struggled in their life is not struggling any more."