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The questions, "Why do we dream?" or "What is the function of dreaming?" are easy to ask but very difficult to answer. The most honest answer is that we do not yet know the function or functions of dreaming.

en.wikipedia.org/wiki/Dream

A dream is a succession of images, ideas, emotions, and sensations that usually occur ... During a full eight-hour night sleep, most dreams occur in the typical two hours of REM. .... The film version of The Wizard of Oz (1939) depicts a full-color dream that causes Dorothy to perceive her black-and-white reality and those with  ...

www.medicalnewstoday.com/articles/284378.php

Feb 23, 2017 ... Nightmares are distressing dreams that cause the dreamer to feel a number of disturbing emotions. Common feelings include fear and anxiety.

www.webmd.com/sleep-disorders/guide/dreaming-overview

Sep 17, 2016 ... WebMD talks about dreams: what makes us dream, if dreams mean anything, what lucid dreaming is, and more.

www.psychologytoday.com/blog/sleep-newzzz/201502/why-do-we-dream

Feb 13, 2015 ... Many scientists studying sleep and dreams believe that dreaming does ... We don't know precisely what causes RBD, but it is associated with ...

chealth.canoe.com/healthfeature/gethealthfeature/dreams-the-mysteries-of-sleep

Nightmares flash across our minds, vivid and frightening, and our hearts pound. And unlike most dreams, nightmares ...

www.womenshealthmag.com/health/what-causes-crazy-dreams

Jun 27, 2016 ... Here's a list of eight reasons why you're dreams are totally out of this world crazy.

health.howstuffworks.com/mental-health/sleep/dreams/5-reasons-why-you-dream.htm

Some people remember vivid dreams; some swear they cannot remember dreaming at all. Some dream in black and white; most people dream in color.

www.huffingtonpost.com/2013/03/27/dream-meaning-health-dreams_n_2957121.html

Mar 27, 2013 ... If stress and anxiety can cause such strange and often upsetting dreams, it should come as no surprise that more serious mental health ...

sleep.org/articles/causes-nightmares

These frightening, too-realistic dreams can leave you feeling rattled, and in more severe cases, they can cause sleep deprivation—which is linked to heart ...