Your body may be still, but as you dream, your eyes can flicker manically. The rapid eye movement stage of sleep is when we have our most vivid dreams – but do our flickering eyes actually “see” anything?
It is a question psychologists have been asking since REM sleep was first described in the 1950s, says Yuval Nir at Tel Aviv University in Israel. “The idea was that we scan an imaginary scene,” says Nir. “It’s an intuitive idea, but it has been very difficult to provide evidence for it.”
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