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https://www.youtube.com/watch?v=fbC7h0LNIi4
By NOVA

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People have known about dreams for a long time. We think of htem as an every-day thing, but some people bevieved

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People have had different theories over the centuries. The Ancient Greeks thought that when you dreamed, your wounds healed. Some people thought you could tell the future by dreaming. A common misconception was that when you die in your dream and then die in real life. None of these theories are true.

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Recurring dreams are actually caused by real life issues. If you have that issue for a long time, you may have the same recurring dream for a long time. Sometimes, your recurring dream gives you hints about how to solve it.

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Nightmares are what we consider as "bad dreams." These nightmares are more common in children. Nightmares can be caused by many things, including medications, stress, illness, trauma, and emotions. If you have more nightmares than others, you may be more emotional and trusting than others. Nightmares can be remembered better than regular dreams.

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Scientists have found out a lot about dreams, but we still have a huge amount of things to discover. Scientists have made a few tests to see what we're dreaming about. Two of the older tests are electroencephalography (EEG) and magnetoencephalography (MEG). These methods are terrible at looking at your dreams, so scientists have made a few newer ones. An example is functional magnetic resonance imaging (fMRI). With these new methods, scientists are starting to get more information about why and how we dream.

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Pretty much every night, most animals dream. Sometimes when you dream, your body moves accordingly to the dream. This is how sleepwalking occurs. However, this cannot occur in REM sleep (see REM Sleep for details). Some dreams that you have may be wishes you have in real life, like getting a good grade.

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Along with regular sleep, there’s also REM and NREM sleep. REM sleep means rapid eye movement sleep, and NREM sleep means non-rapid eye movement sleep. You have your most detailed dreams in REM sleep. NREM sleep is just your regular sleep. Although, NREM sleep has three stages, while REM has one.