A new study finds that we respond to simple commands, such as smiling or frowning, in certain phases of sleep
Scientists once considered sleep to be like a shade getting drawn over a window between the brain and the outside world: when the shade is closed, the brain stops reacting to outside stimuli.
“You’re not supposed to be able to do stuff while you sleep,” says Delphine Oudiette, a cognitive scientist at the Paris Brain Institute in France and a co-author of the study. Historically, the definition of sleep is that consciousness of your environment halts, she adds. “It means you don’t react to the external world.”
Karen Konkoly, who was a co-author on that study and a cognitive scientist at Northwestern University in Evanston, Illinois, says that after that paper came out, “it was a big open question in our minds whether communication would be possible with non-lucid dreamers.” Overall response rates were higher for all participants during REM sleep, when the deepest sleep occurs but the brain remains quite active, than during other sleep stages. The researchers tracked participants’ brain activity during the experiments using electroencephalography , which captures signals from electrodes placed along a person’s scalp.
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