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Dreams can be fuzzy, and not just because they can be hard to remember. They’re hard to study, too. Ever since Sigmund Freud hypothesized that daytime experiences influence the content of our dreams, psychologists and neuroscientists have grappled with how our dreams connect to our waking lives. And new research suggests there’s a scientific way to associate dreams with specific periods of waking time.

According to a paper published June 4 in the journal Social Cognitive and Affective Neuroscience, scientists found that they can use certain biomarkers in people who are dreaming to identify when they formed the memories that made up the contents of their dreams. To figure this out, researchers recorded the brainwaves of 20 students with an electroencephalograph throughout several nights of sleep. They woke the students up during rapid eye movement (REM) sleep and slow wave sleep and asked them to report on what they were dreaming. They then matched the contents of the dreams to 10 days of personal diaries the students kept during the previous days — while they were awake, of course.

Read more at: https://www.inverse.com/article/47351-how-can-you-tell-what-someone-is-dreaming-scientists-gaze-into-brains

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