Scientists Just Proved That Your Brain Can Dream While You Are Wide Awake
A study from the Paris Brain Institute, published in Cell Reports, has overturned something most people take for granted: that dreaming and waking are two cleanly separate mental states, each with their own type of thoughts. Researchers monitored 92 adults using EEG caps as they drifted into and out of light sleep during daytime rest periods, interrupting them at various moments and asking them to describe what had been happening in their minds for the previous 10 seconds. What they found was that the mind does not obey the line we draw between waking and sleeping: vivid, bizarre, dreamlike experiences showed up regularly in people who were fully awake by every brain signal, while orderly, practical thoughts like running through a schedule were recorded in people who had already fallen asleep by every measurable brain measure. One participant, while technically awake, reported seeing ants crawling across her body against a backdrop of crossword puzzles; another, while fully asleep, was mentally planning his schedule for the next day.
The researchers identified four distinct mental states that appeared across all three vigilance stages studied, wakefulness, sleep onset, and light sleep: a fleeting state of brief involuntary memories, an alert state with clear awareness of surroundings, a bizarre state featuring strange imagery, and a voluntary state of intentional goal-directed thought. None of these four states was locked to a particular stage of sleep or wakefulness, meaning what the brain is doing appears to matter far more than whether the body is technically asleep or awake. The lead researcher at the Paris Brain Institute said the study confirms there is a continuum between waking and sleep with intermediate states where certain brain regions may already be asleep even as others remain active. The team says the finding has implications for understanding disorders like insomnia and narcolepsy, and for any future effort to understand what consciousness actually is and how it shifts.
