Reduced sea ice is threatening polar bears in the Arctic. Listener Kevin wanted to know if they would thrive at the south pole instead? Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

What causes sleepwalking?

Each week we set out to solve one of the world's weirdest, wackiest, funniest and funkiest scientific puzzles. And along with the answer there's a brand new question to think about for next time...