Dimitrios Kambouris / WireImage 1 / 12
Dimitrios Kambouris / WireImage 1 / 12

Sinead O'Connor is determined to strip down to nothing for a Playboy shoot before she dies -- because she was too "miserable" to shed her clothes when she was a young singer.

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The "Nothing Compares 2 U" hit maker, 45, is eager to pose for a racy spread in Hugh Hefner's magazine in the future, and has another desire she wants to carry out in her lifetime.

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She tells The Word magazine, "There's so much I wouldn't [have] liked to do when I was younger and I was too miserable and Irish."

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"A Playboy shoot is on my bucket list. And I like the idea of doing some interview in weird sex gear, talking about something really serious. The economy! You can talk about serious issues while you're b------ naked, on all fours, in your dog collar!"