Vivid dreams might be doing more than entertaining your mind at night; they could actually be the key to feeling truly well rested. A new study from researchers at the IMT School for Advanced Studies Lucca found that immersive dreaming can make sleep feel deeper and more refreshing, even when brain activity remains high. The research analyzed 196 overnight recordings from 44 healthy adults and found that people reported their deepest sleep after intense dream experiences, not just during quiet, inactive periods .

What Does the Research Actually Show About Dreams and Sleep Quality?

For decades, scientists believed deep sleep meant a brain that was essentially "switched off," with minimal activity and slow brain waves. Dreaming, which occurs during Rapid Eye Movement (REM) sleep, was thought to be a sign of partial wakefulness. This created a puzzling contradiction: REM sleep involves intense brain activity similar to being awake, yet people often report feeling deeply asleep during this stage .

To solve this puzzle, researchers at the IMT School conducted a detailed analysis over four nights. They awakened more than 1,000 times across all participants and asked them to describe what they were experiencing just before waking. Participants also rated how deeply they felt they had been sleeping and how sleepy they were. The results were striking: people reported the deepest sleep not only when they had no conscious experience, but also after vivid, immersive dreams. In contrast, shallow sleep was linked to minimal or fragmented experiences, such as a vague sense of presence without clear dream content .

"In other words, not all mental activity during sleep feels the same: the quality of the experience, especially how immersive it is, appears to be crucial. This suggests that dreaming may reshape how brain activity is interpreted by the sleeper: the more immersive the dream, the deeper the sleep feels," explained Giulio Bernardi, professor in neuroscience at the IMT School and senior author of the study.

Giulio Bernardi, Professor in Neuroscience at IMT School for Advanced Studies Lucca

How Do Dreams Help Maintain the Feeling of Deep Sleep Throughout the Night?

Another surprising finding emerged as the night progressed. Even though physiological signs of sleep pressure gradually decreased, participants reported that their sleep felt deeper as time went on. This perceived deepening closely followed an increase in how immersive their dreams became. The findings suggest that dream experiences may help preserve the feeling of deep sleep even as the body's biological need for sleep declines .

Immersive dreams may also help maintain a sense of separation from the external environment, which is a key feature of restorative sleep, even while parts of the brain remain active. This discovery has important implications for understanding why some people feel they sleep poorly even when standard sleep measurements appear normal.

Ways to Support Better Dream Recall and Sleep Quality

• Keep a Dream Journal: Writing down your dreams immediately after waking can help you remember them more vividly and become more aware of your dream patterns throughout the night.
• Maintain Consistent Sleep Schedules: Going to bed and waking at the same time each day helps regulate your circadian rhythm and may enhance the quality and vividness of your dreams.
• Optimize Your Sleep Environment: Creating a dark, quiet, and cool bedroom supports deeper sleep stages where vivid dreaming is more likely to occur and be remembered.
• Avoid Sleep Disruptions: Minimizing nighttime awakenings allows your brain to progress through full sleep cycles, including the REM sleep stage where most vivid dreaming happens.

The research opens new perspectives on sleep health and mental well-being. Rather than being merely a by-product of sleep, immersive dreams may help buffer fluctuations in brain activity and sustain the subjective experience of being deeply asleep. This echoes a long-standing hypothesis in sleep research, and even in classical psychoanalysis, that dreams may act as "guardians of sleep" .

Understanding how dreams contribute to the feeling of deep sleep could help explain why alterations in dreaming might partly account for why some people feel they sleep poorly even when objective sleep indices appear normal. If dreams help sustain the feeling of deep sleep, then conditions or medications that suppress dreaming could potentially affect how rested people feel, even if their total sleep time remains unchanged.

The study was carried out as part of a broader collaboration between the IMT School, Scuola Superiore Sant'Anna in Pisa, and Fondazione Gabriele Monasterio, where a new sleep laboratory has been established to integrate neuroscientific and medical expertise. These findings represent an early step in understanding how brain-body dynamics shape sleep in both healthy individuals and those with sleep disorders, and they provide a foundation for future research into the role of dreams in sleep quality and overall well-being .