Question: Why do nightmares only appear when I am sleeping?

Sonia Lenehan answered on 6 Nov 2018:

No one is really sure. Sleep is something that we are still trying to figure out. It could be because sleep is a time when the brain does not have to take in anything new and gets a chance to take a look and sort through all the information it has taken in throughout the day, other think its because your emotions or feelings come through in your sleep and other scientists think it may just be your neurons testing out how they fire! So there is a lot more we need to learn about sleep and nightmares!