We think of sleep as a period of relaxation and recuperation, but while we snooze, our brains remain incredibly busy, often with intriguing "side effects" like dreams and sleepwalking. What does the mind get up to when we're not paying attention?
Have you ever arrived at your destination with no memory of the journey that got you there? Your unconscious mind has been at work. Does that mean we don't always have free will over our actions and decisions? And what does that tell us about the brain?
The study of dreams is a fascinating journey through neuroscience, biochemistry, psychology, history and anthropology. How do dreams differ around the world, and what do they tell us about the world itself?
The body can create a shocking array of symptoms, from paralysis to seizures, seemingly without any medical explanation. Is the brain responsible, and if so, why does it do it?
How can someone on an acid trip see sounds or hear colours? And why do some people have this same experience all the time, drug-free?