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Adam Walton sits down with Eryri National Park Dark Skies Officer, Dani Robertson, to discuss her new book 'All Through the Night: Why Our Lives Depend on Dark Skies'.

We also hear from Jacqueline Yallop, who, inspired by her father’s dementia and his anxiety about the dark, wrote a book re-examining her own relationship with darkness called ‘Into the Dark: What Darkness Is and Why It Matters’.

Produced by Stuart Russell.