In the basement of a museum, there exists an imaginary world. It is called The Archive of All-in-All. Here, “it is always late at night and always raining outside”, says actor Hayley Atwell, who conceived the comforting, cocooning space – one of the immersive audio scenescapes available on the Sleep Worlds app, which launched fully in February this year.

“I loved the idea of a building with one light on, and [describing] what happens down in the basement,” Atwell continues, “with someone doing filing, someone doing art restoration, and everything scaled down, like a doll’s house.” Her eyes light up as she describes the quiet industry of the subterranean labyrinth. Poet Emily Berry, who wrote the “world” into being with novelist Joe Dunthorne, adds: “It’s like an underground library – like my safe space. Somewhere soothing.”

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Hayley Atwell reads a clip from The Archive of All-in-All, one of the Sleep Worlds, at Arnason 1 studio in Fitzrovia © Mark Shearwood