"Have you ever been told to "stay awake on a problem?" Instead you are instructed to "sleep on it." Interestingly, this phrase exists in most languages, indicating that the problem-solving benefit of dream sleep is universal, common across the globe." Thankfully, now we have the science to support what we've have known all along. Sleeping, specifically REM sleep, is the brain's way of processing the emotions and problems of the day. Quoted from the book, Why We Sleep by Matthew Walker
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