David Hepworth

Both traditional broadcasters and podcasters are betting heavily on the growth of voice-driven technology and so-called smart speakers, the theory being that it is as easy to ask Amazon's Alexa to play you the 'Guardian Books' podcast as it is to get it to play Capital FM.

The neurologist calls it 'Non-REM parasomnia'. For the sufferer, it might mean rising in the middle of the night, getting your motorbike out, going for a ride, and waking in the morning with no memory of the experience.

Bobby Bones is a young country DJ who does a widely syndicated morning show. He's at his best with his BobbyCast, in which he talks to Nashville up-and-comers such as Kelsea Ballerini and Lauren Alaina. Guests are encouraged to relax on Bones's couch and talk about anything they like.

The podcast 'A History of Jazz' began telling its story in February - 100 years after the recording of 'Livery Stable Blues' by the Original Dixieland Jazz Band, the start of jazz as a legitimate branch of music.

Anyone born in the year 1950 who grew to fancy themselves as a soulful 18-year-old bought 'Songs of Leonard Cohen' upon its original release in 1968. For many of them, it was the beginning of a lifelong friendship.

All political careers end in failure, but few did it so quickly as David Cameron's. He came to power promising not to 'bang on about Europe' and ended up having the continent's name chiselled into the lid of his political coffin.

'How I Built This With Guy Raz' asks entrepreneurs to tell the story of how they made their name and, in some cases, their fortune. Whether they're in the business of selling burritos or dating apps, there's inevitably something you can learn from their stories.

Christmas is a time for slipping into familiar patterns.

The great children's author and illustrator Shirley Hughes marks her 90th birthday by appearing as Michael Berkeley's guest in 'Private Passions'.