Dreams

Although the frequency and content of dreams vary depending on a number of factors like age, stress, sleep schedule, etc., almost everyone is familiar with what dreams are. However, as dreams are still among the more perplexing and frequent brain phenomena you are aware of, no one is certain what exactly happens inside the brain while you dream.

One study suggests that multiple brain regions, as opposed to just one, are involved in dreaming, including those in charge of memory, emotion, and reward, albeit it doesn't explain how exactly these regions interact to create dreams. Additionally, it's unclear when you dream. Although it was always thought that you could only dream while you were in the REM stage of the sleep cycle, more recent studies have revealed that you can dream while you are in non-REM sleep as well. Keep reading to explore more unexplained mysteries of the brain.