He says: "I love my privacy and I always have, but I unknowingly trained myself to only get to the dark, lowest points when I'm by myself. After that I was just concealing my illness from everyone. I didn't want others to know.

"After the Say Anything tour we split ways like we always do, but for whatever reason I thought they abandoned me. That kind of pushed me back into my manic bipolar state.

"It wasn't uncommon for a very simple thing to be a trigger for me. Just us parting ways was enough for me to drink a bottle of whisky the following night.

"You do that 10 days in a row, then you don't have to think about going on the roof - it just sort of happens."

In the film Lukens tells how he confided in friends and family, sought treatment and was diagnosed with bipolar disorder. He adds: "They saved my life. It's not a joke to play around with depression or mental health. it's not wrong to seek or receive help. The last few months have meant a lot and it's changed the way I look after myself and write.