Agi: Un sogni vividi rendono il sonno più profondo

AGI - I sogni immersivi, accompagnati da un aumento dell'attività cerebrale simile a quella della veglia, portano a una maggiore sensazione di sonno profondo. Lo rivela uno studio, pubblicato sulla rivista Plos Biology, condotto dagli scienziati della Scuola IMT Alti Studi Lucca.
Il team, guidato da Giulio Bernardi, ha analizzato le registrazioni di elettroencefalogramma di 44 adulti che per quattro notti sono stati svegliati ripetutamente. L'analisi ha dimostrato che i passaggi da onde cerebrali più veloci a onde più lente erano effettivamente associati a una sensazione di sonno profondo. Tuttavia, questa relazione si indeboliva quando i partecipanti riferivano di aver sognato, anche se non riuscivano a ricordarne il contenuto.
Sogno e onde cerebrali
I ricercatori hanno scoperto una relazione fondamentale tra il sogno e la sensazione di aver dormito bene. La letteratura scientifica dimostra che la sensazione di sonno profondo è legata a un passaggio dalle onde cerebrali ad alta frequenza a quelle a bassa frequenza, che si ritiene siano alla base dell'incoscienza. La fase REM, invece, viene percepita come più profonda, anche se le onde cerebrali sono simili a quelle della veglia.
Tipi di sogni e qualità del sonno
Stando a quanto emerge dall'indagine, i sogni vividi, bizzarri ed emotivamente intensi erano tutti associati a un sonno soggettivamente più profondo, mentre sogni astratti, riflessivi e meta-consapevoli erano correlati a una sensazione di sonno più superficiale. Questi risultati contraddicono la convinzione consolidata secondo cui la sensazione di sonno profondo sia governata esclusivamente da onde cerebrali lente e dalla profondità dell'incoscienza, e suggeriscono che il sogno percettivamente immersivo sia ciò che ci permette di sentirci ben riposati, anche se non si ricorda il contenuto onirico.
Implicazioni per la salute del sonno
"Comprendere come i sogni contribuiscono alla sensazione di sonno profondo - afferma Bernardi - apre nuove prospettive sulla salute del sonno e sul benessere mentale. Alterazioni nel ciclo onirico, ad esempio una riduzione della ricchezza o della frequenza dei sogni, potrebbero influenzare la percezione della profondità o della durata del sonno e contribuire all'insoddisfazione per la sua qualità".

Vivid dreams make sleep deeper.

AGI - Immersive dreams, accompanied by an increase in brain activity similar to that of wakefulness, lead to a greater sense of deep sleep. This is revealed by a study, published in the Plos Biology journal, conducted by scientists at the IMT Alti Studi Lucca School.

The team, led by Giulio Bernardi, analyzed electroencephalogram recordings of 44 adults who were repeatedly awakened for four nights. The analysis showed that the transitions from faster brain waves to slower waves were actually associated with a feeling of deep sleep. However, this relationship weakened when participants reported having dreamed, even if they couldn’t recall the content.

Dream and Brain Waves
Researchers discovered a fundamental relationship between dreaming and the feeling of having slept well. Scientific literature demonstrates that the sensation of deep sleep is linked to a transition from high-frequency brain waves to low-frequency waves, which are believed to be at the base of unconsciousness. The REM phase, on the other hand, is perceived as deeper, even though the brain waves are similar to those of wakefulness.

Types of Dreams and Sleep Quality
According to the investigation, vivid, bizarre, and emotionally intense dreams were all associated with sleep that was subjectively deeper, while abstract, reflective, and meta-conscious dreams were correlated with a feeling of more superficial sleep. These results contradict the established belief that the sensation of deep sleep is governed solely by slow brain waves and the depth of unconsciousness, and suggest that perceptually immersive dreaming is what allows us to feel well-rested, even if the dream content is not remembered.

Implications for Sleep Health
“Understanding how dreams contribute to the feeling of deep sleep – Bernardi states – opens up new perspectives on sleep health and mental well-being. Alterations in the dream cycle, for example, a reduction in the richness or frequency of dreams, could influence the perception of the depth or duration of sleep and contribute to dissatisfaction with its quality.”

#PlosBiology #GiulioBernardi #Bernardi

https://www.agi.it/scienza/news/2026-03-25/sogni-sonno-profondo-36273193/

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