Why is the Asian Carp so hard to stop?

Why is it so hard trying to "continue" a pleasent dream after we woke up? At the same time why it is so hard to stop/change the nightmare?

If you're dreaming something good, if you suddenly wake up, it is very hard to close your eyes and try to continue that dream. But if you have a nightmare and you wake up in the midle of the night, even if you stay awake for a few minutes, it's very hard to change the subject to another dream.
Answer:

The good dream is hard to continue because upon waking, the "fantasy vs. reality filters" in your brain have been activated, and you realize that your experience was just a dream. The nightmare is different in that your "threat sensors" are also activated and they can tend to override your "fantasy vs. reality filters".

Andrew Weimholt at Quora Visit the source

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