Adele suffers "really bad seasonal depression".
The singer, 35, who shed around seven stone (44kg) as part of a lifestyle overhaul, has seasonal affective disorder (SAD), which sparks depression while the weather is bleak.
She said in a rare interview with The Hollywood Reporter: "I get really bad seasonal depression, so the weather [in America] is good for me.
"It is strange sometimes, because I'm very British. Because it's a bit harder for me to go out nowadays, what I love the most about LA is everyone goes to each other's houses. I like that."
Adele was also asked if she has considered acting, and replied: "There is one movie I want to do, but the guy whose movie it would be, he's not mentally ready to write the script for it… I'm not giving you no clues, though. I bug him every now and then about it, but he's just not there yet.
"But that's the only role I ever want, because I think I'd nail it."
Adele also revealed she would rather work in showbiz out of the spotlight.
She said: "My dream job is to be a script reader. People think it's hilarious and they don't take me seriously. I say to my manager, 'I want to be really successful at something.' He's like, 'What?'
"I was like, 'But [music] is my hobby. I just fell into it. I want to be in TV and behind the scenes.'"
And Adele admitted her gigs — which have included her run in Las Vegas over the last year — made her fear she would ruin her vocal cords.
She added: "I get nervous about wearing my voice out. [The show is] a lot of singing. It's two hours. It's all live. And I chat as well."
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