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Horizon uncovers the secret world of our dreams. In a series of cutting-edge experiments and personal stories, we go in search of the science behind this most enduring mystery and ask: where do dreams come from? Do they have meaning? And ultimately, why do we dream? What the film reveals is that much of what we thought we knew no longer stands true. Dreams are not simply wild imaginings but play a significant part in all our lives as they have an impact on our memories, the ability to learn, and our mental health. Most surprisingly, we find nightmares, too, are beneficial and may even explain the survival of our species.

Other episodes for this season

Why Are Thin People Not Fat?
Episode 1 - Why Are Thin People Not F...
Cannabis: The Evil Weed?
Episode 2 - Cannabis: The Evil Weed?
Why Do We Dream?
Episode 3 - Why Do We Dream?
Can We Make a Star on Earth?
Episode 4 - Can We Make a Star on Ear...
The Secret Life of Your Bodyclock
Episode 5 - The Secret Life of Your B...
What's the Problem with Nudity?
Episode 6 - What's the Problem with N...
How to Survive a Disaster
Episode 7 - How to Survive a Disaster
Who Do You Want Your Child to Be?
Episode 8 - Who Do You Want Your Chil...
Why Can't We Predict Earthquakes?
Episode 9 - Why Can't We Predict Eart...
Alan and Marcus Go Forth and Multiply
Episode 10 - Alan and Marcus Go Forth...
How Violent Are You?
Episode 11 - How Violent Are You?