(INDEPENDENT) — A team of Israeli scientists may have discovered why your eyes flicker when you sleep.
Everyone's heard of rapid eye movement (REM) sleep, which often occurs during dreaming.
It's previously been thought that this eye movement could be due to us 'looking around' in our dreams - however, this type of movement also occurs in people who have been blind since birth, and even in fetuses, despite their lack of vision.
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Other theories suggest that the fast flickering helps supply oxygen to your cornea, or that it is simply the random result of unconscious brain activity.