Why we dream

We spend around six years of an average life dreaming, and nobody can tell you for certain why. That’s the honest starting point. Sleep science has good theories and real evidence, but the question “why do we dream” remains genuinely open. It is one of those rare cases where the experts and the mystics are both still guessing, just in different directions.

What we do know is that dreaming happens mostly during REM sleep, the stage where the eyes flick about under closed lids and the brain lights up almost as if awake. Most of us cycle through REM several times a night. So the raw fact of dreaming is settled. The purpose is where it gets interesting.

What sleep science leans towards

A few theories carry the most weight, and they don’t entirely rule each other out.

The memory one is the strongest contender. The brain seems to use sleep to sort through the day: filing what matters, dumping what doesn’t, knitting new information into what’s already there. On this reading, dreams are something like the visible spillover of that overnight sorting, which is why so much dream content is a warped remix of recent life.

There’s the emotional-processing idea, which holds that dreams let us work through feelings in a low-stakes space, taking the sharp edge off difficult experiences while we sleep. It would explain why a rotten day so often turns up, scrambled, in the night that follows.

And there’s the older threat-rehearsal theory, the idea that dreaming evolved to let our ancestors practise facing danger safely, which fits the sheer number of dreams about being chased, falling or turning up somewhere unprepared. None of these has won outright. The likeliest answer is that dreaming does more than one job at once.

The spiritual reading

Long before any of this, people treated dreams as messages: from gods, ancestors, the dead, or the deeper parts of the self. Nearly every culture has kept dream-interpreters of some kind, and the practice hasn’t gone anywhere.

The modern version owes a lot to the early psychologists. Freud read dreams as disguised wishes bubbling up from below; Jung went further, seeing them as the unconscious speaking in symbols, often nudging the dreamer towards something they’d been avoiding awake. Whatever you make of the theories, the instinct behind them is old and widespread: that a dream is the self talking to itself in a language it only uses at night.

Holding both at once

Here’s where the magazine lands, and it’s not a fence-sit. A dream can be the brain tidying its files and worth paying attention to. The two aren’t rivals.

Say you keep dreaming about a house you grew up in. The neuroscientist might call it memory consolidation, your brain shuffling old material. Fair enough. But if that dream leaves you thinking about your childhood, your family, something unfinished. That response is real, and following it can tell you something true about where you are now. The meaning you find in a dream is valid even if no one put it there on purpose.

So read your dreams. Keep a notebook by the bed, because they vanish within minutes of waking and the good detail goes first. Don’t treat them as prophecy or as instructions. Treat them as the strangest, most honest commentary your own mind produces, and worth a look in the morning.