Adele knows she's written a good song when it makes her cry.
The 'Hello' singer only feels confident with her new material when it has "really moved" her and leaves her needing a moment alone to compose herself.
She said: "In order for me to feel confident with one of my songs it has to really move me.
"That's how I know that I've written a good song for myself -- it's when I start crying. It's when I just break out in f***ing tears in the vocal booth or in the studio, and I'll need a moment to myself."
The 27-year-old singer admits she used to "drown" in her emotions when writing her second album '21' but loved the "drama" of "falling apart".
She recalled to the New York Times newspaper: "I just used to let myself drown. If I was sad, if I was confused -- which I would say were the running themes for most of my records so far -- I'd just go with it.
"I'd let myself fall apart, and I'd sit in darkness, and I'd feel sorry for myself, and I wouldn't accept any help to get out of it, in terms of going out with my friends to cheer me up, or staying busier.
"No! I loved the drama of it all."
But the 'Skyfall' singer never wants to bring herself so low again, because of her responsibilities to her partner Simon Konecki or their three-year-old son Angelo.
She said: "I haven't got time to fall apart. I'm the backbone for my kid, and I want to be there for him. And I want to be there for my boyfriend as well, and I don't want to bring them down with me for my art."