EXPLAINER - Why do we dream, and what can dreams really tell us?

Every night, our minds take us on vivid journeys, from surreal landscapes to oddly familiar scenarios. But what exactly are dreams, and why do we have them? Scientists still don’t have all the answers, but what they’re discovering is as fascinating as the dreams themselves.

Have you ever woken up from a dream and thought, What on Earth was that about? Maybe you were flying over a forest, being chased by a shadowy figure, or giving a speech in your pyjamas. Dreams can be strange, emotional, funny, or downright terrifying. But why do we dream at all, and do our dreams actually mean anything?

Despite decades of research, dreaming remains one of the great mysteries of the human mind. Scientists know that we all dream (yes, even if you don’t remember it), and that most of our dreaming happens during REM sleep, a stage when the brain is almost as active as when we’re awake. But as for the why, the science is still evolving.

Let’s explore what we know so far.

What are dreams, exactly?

Dreams are the images, thoughts, and feelings that unfold in your mind while you sleep. They often feel vivid, emotional, and sometimes totally illogical. Some people dream in colour, others in black and white. People who are blind from birth tend to dream with sound, touch, and smell.

Typical features of dreams include:

• A first-person point of view
• Emotional intensity
• Bizarre or unrealistic storylines
• Appearances by familiar people (or total strangers)
• Elements pulled from waking life — things you’ve seen, felt, or worried about

“Dreams give us a private space where our minds can explore without limits, that’s both fascinating and useful,” says Dr. Michelle Drerup, a behavioural sleep medicine specialist.

So… why do we dream?

There’s no single answer — but several fascinating theories try to explain it. Here are the most popular ones:

Memory booster: Dreams might help us store and organise memories, especially the stuff we’ve just learned.
Emotional processor: Dreaming could help us work through feelings, fears, and even trauma in a safe space.
Mental “spring cleaning”: Some scientists believe dreaming helps the brain filter out unnecessary or conflicting information.
Problem-solving lab: Ever woken up with a solution to a problem? Some researchers think dreams help us rehearse situations and explore creative ideas.
Just random brain activity: According to some, dreams don’t have a purpose — they’re just the result of your brain firing off signals while you sleep.

“It may be that dreaming is simply what the brain does when it’s offline but still active,” says neuroscientist Dr. Robert Stickgold. “But that doesn’t mean it’s meaningless — far from it.”

The truth? It could be a mix of all the above.

Why are dreams so weird?

Blame it on your brain chemistry. During REM sleep, the part of your brain that handles logic and control goes quiet, while areas linked to emotion and memory light up. Chemicals like dopamine are more active, which may explain the surreal, often chaotic nature of dreams.

“Dreams feel bizarre because your brain isn’t filtering the way it does when you’re awake,” explains sleep researcher Dr. Tore Nielsen. “It’s like switching from a structured movie to a montage of ideas.”

Do we dream every night?

Almost certainly, yes. Most people have several dreams per night, especially during REM sleep. The reason you don’t always remember them? You likely weren’t awake during or right after the dream, and dreams fade fast.

“We dream multiple times a night, it’s just that most dreams vanish within minutes of waking,” says Dr. Drerup.

Want to remember more of your dreams? Keep a dream journal by your bed and jot things down the moment you wake up. Even a sentence or two helps.

What about nightmares and stress dreams?

Nightmares are just intense, unpleasant dreams, and they’re completely normal. Stress, anxiety, and trauma (such as in PTSD) can all increase the likelihood of having bad dreams.

Common stress dream themes include:

• Being chased
• Falling
• Showing up unprepared
• Losing control

“Nightmares aren’t just random, they often reflect unresolved emotional tension or anxiety,” says Dr. Rosalind Cartwright, a pioneer in dream research.

Can dreams help with creativity?

Absolutely. Some of the most famous creative breakthroughs reportedly came from dreams. Think Paul McCartney dreaming up “Yesterday,” or the invention of the sewing machine inspired by a nightmare.

Because dreaming disconnects us from real-world limitations, the mind is free to wander and play — and sometimes stumble upon something brilliant.

“Dreaming is a great playground for the creative mind,” says Dr. Deirdre Barrett, author of The Committee of Sleep. “Our brains are solving problems without us even trying.”

What about lucid dreams?

Lucid dreaming is when you realise you're dreaming while you’re in the dream. Some people can even control what happens next. While not everyone experiences them regularly, studies show that lucid dreamers often score higher on creativity and imagination tests.

If you've ever flown like Superman or bent the laws of gravity in a dream, and known it was a dream, you’ve probably had a lucid dream.

“Lucid dreams give us a rare opportunity to become conscious explorers of our inner world,” says psychologist Dr. Keith Hearne, who conducted the first scientific study on lucid dreaming.

So… do dreams have meaning?

It depends who you ask. Freud famously thought dreams were windows into our unconscious desires. Others believe dreams reflect our daily thoughts, worries, and emotions — a kind of mirror to waking life.

Modern scientists tend to be cautious: while dreams may be meaningful, they’re also highly personal and subjective.

“There’s no universal dream dictionary,” says Dr. Drerup. “What your dream means depends on you — your life, your memories, your emotions.”

Instead of turning to dream dictionaries, psychologists suggest looking inward: What’s happening in your life right now? What emotions did the dream stir up? What do you think it meant?

Final thoughts: dreams are still a mystery worth exploring

We spend about two hours each night dreaming, that’s roughly six years of the average person’s life. And yet, we’re only just beginning to understand this nightly phenomenon.

Whether dreams are random brain chatter, emotional therapy, or creative inspiration, one thing is certain: they’re a fascinating part of being human.

“We may never fully understand dreams,” says Dr. Stickgold, “but they remain one of the most personal, strange, and beautiful frontiers of the human mind.”

So the next time you wake up puzzled by a strange dream, don’t worry too much about decoding it. Maybe it’s your brain’s way of helping you be human, one surreal scene at a time.

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