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If you've been cured of a phobia, say of spiders, and finally made your peace with the hairy-legged beasties in real life - why might you then start having vivid nightmares about them?

Following an email plea for an explanation of this mystery Claudia Hammond enlists Dr Lampros Perogamvros, a psychiatrist from the University of Geneva who鈥檚 done extensive research around dreams and nightmares, to help answer listener Lesley's query.

Meanwhile a new study by researchers at the USA's Columbia University is looking into the benefits of treating post-cardiac arrest PTSD with mindfulness. Claudia speaks to research scientist Dr Maja Bergman about how she was motivated to start the project by her own experience of a sudden cardiac arrest, in her thirties. We also hear from survivors via the support group Sudden Cardiac Arrest UK, about their experiences and recoveries.

Joining Claudia in the studio to discuss these stories and more is Dr Peter Olusoga, a Senior Lecturer in Psychology at Sheffield Hallam University - who also has thoughts to share on new research into athletes shouting at umpires, and what affects our levels of impatience.

Presenter: Claudia Hammond
Producer: Lucy Taylor
Studio Manager: Tim Heffer
Production Coordinator: Siobhan Maguire
Editor: Holly Squire