Rapid eye movement, or REM, is a stage of sleep in which you’re most likely to dream.

Your heart rate, blood pressure, and even temperature might rise in this phase – and your eyes, well, rapidly move.

During REM, Harvard Health says , “muscles in your arms and legs also become temporarily unable to move” to prevent you from acting out your dreams.

But why do our peepers stay so active?

According to a 2022 paper published in Science, the answer to that might involve your dreams, too.

Why do our eyes move during REM?

According to the paper, in mice, it seems to happen because their eyes are following the scenes in our dreams.

Previously, scientists wondered whether this movement was random.

But this study looked at the “head direction” of dreaming mice, or the area in which th

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