Published on: Oct 29, 2025
In a groundbreaking study, researchers have revealed that the human brain does not drift gradually into sleep but instead transitions abruptly at a distinct tipping point between wakefulness and sleep. Using advanced computational modeling and EEG recordings from over a thousand participants, the team—led by the UK Dementia Research Institute at Imperial College London and the University of Surrey—was able to predict the precise moment of sleep onset with 98% accuracy.
Published in Nature Neuroscience, the study introduces a novel way to map brain activity in a multi-dimensional feature space, showing that regardless of how long a person spends in bed, the final shift into sleep happens suddenly, much like a stick snapping or an object falling.
Each individual was found to have a unique but consistent sleep entry point,revealing highly personalized sleep signatures. This breakthrough could pave the way for more accurate diagnostics and treatments for sleep disorders such as insomnia, offer new markers for brain health in ageing and neurodegenerative diseases, and even improve anaesthesia monitoring during surgery.
Source: https://www.surrey.ac.uk/news/scientists-uncover-how-brain-falls-asleep
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