The Science of Dreams: What Lies Hidden in Our Subconscious

Centuries of Speculation: Why Do We Dream?

From the ancient Greeks to Sigmund Freud, people have long sought to understand why we dream and what those dreams mean. Some believed dreams were messages from the gods; others saw them as reflections of our subconscious. However, scientists only began to study this mystery relatively recently, since there was no way to accurately measure what happens in our brains during sleep. Fortunately, thanks to advanced technologies and insatiable curiosity, researchers are now closer than ever to answering the question: why do we dream?

REM Sleep: The Gateway to the Dream World

The first major breakthrough in dream research came in 1952, when University of Chicago scientists Eugene Aserinsky and Nathaniel Kleitman discovered the rapid eye movement (REM) phase of sleep while observing Aserinsky’s son. This phase begins about an hour after falling asleep and recurs several times each night. Intriguingly, during REM sleep the brain is almost as active as it is while awake. In other words, roughly 20% of our nightly slumber—about two hours—is spent dreaming.

Do Dreams Aid Learning? The Tetris Experiment

Harvard researcher Robert Stickgold set out to discover whether dreams can help us consolidate new information. His unconventional test involved the video game Tetris. Participants—experienced players, novices, and amnesia sufferers—were asked to play the game before sleeping. Remarkably, 60% reported dreaming of falling Tetris blocks, and those who did performed better at the game afterward than those who recalled nothing. This suggests our brains use dreams to process and reinforce new learning.

Dreams and Emotion: Can Sleep Help Us Manage Stress?

Berkeley scientists examined how sleep affects emotional processing. Participants first evaluated facial expressions conveying different emotions; then half slept while the other half stayed awake. Those who reached REM sleep responded more strongly to positive emotions and less to negative ones like anger or fear. The findings show that quality sleep boosts emotional regulation, whereas sleep deprivation leaves us more irritable and sensitive to negative feelings.

Why Are Some Dreams So Bizarre?

Sometimes our dreams are so vivid and strange they feel like scenes from a fantasy film, full of mystical creatures and illogical plot twists. Why? A 2010 brain‑imaging study found that the more active the amygdala and hippocampus are during sleep, the more vivid, emotional, and bizarre the dreams become. This means during dreaming our brains not only process daily experiences but also weave them together with deeper memories and emotions.

Dreams are not just a mysterious projection of our subconscious—they’re essential to our emotional and cognitive health. For more restful nights and richer dreams, create a cozy and comfortable sleep environment. Savashome offers a wide range of premium bedding to help you enjoy peaceful, restorative sleep every night.