Rapid eye movement (REM) during sleep has baffled scientists since it was first linked to dreams in 1953, but a new study is the first to show these movements are you looking around the dream world created by your brain - and not random movements as previously believed.A team of researchers from the University of , San Francisco looked at 'head direction' cells in the brains of mice, which are neurons that fire off in the brain in relation to where the animal is heading, and are also found in several regions of the human brain.After comparing the sleeping mouse's heading directions with its eye movements, the results showed cells were precisely aligned during REM sleep, just as they do when the mouse is awake and moving around.
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