system
Given the following post, respond as if you're commenting on Reddit:
human
Are dreams powered by the same parts of the brain that are responsible for creativity and imagination?

And are those parts of the brain essentially “writing” your dreams?
gpt
The topic of dreams is still very much an open question for Neuroscience but scans from fMRI and EEG data seem to suggest that both dreaming and daydreaming are related, though obviously there is even more deactivation of task specific areas of the brain during actual dreaming.

Imagination and kind of idle behaviour are all linked to a large collection of different parts of the brain called the Default Mode Network. This network is generally active when subjects in scans don't have a set task they are trying to accomplish. Sleep and Daydreaming are also linked to this same network.

However, there is much more to dreams than just that. There is a lot of reactivation of parts of the brain during sleep that basically replays recent memories. This is thought to help with memory consolidation and formation and more detailed analysis on other animals (as this requires implanting probes directly into the brain) show brain patterns that both match previous awake patterns in the past, match those patterns but in reverse, and patterns that are similar but with some variation. So it seems the brain not only goes through the days experiences but also creates variations based on them. While most of this seems to happen in Slow Wave Sleep rather than REM Sleep where most Dreams are, there's more recent evidence showing it happens there too.

Together, it seems that, at the very least, Dreams are combinations of imagination, your previous experiences and memories, as well as variations and combinations of them.

That is not to mention the very likely possibility of other smaller (in terms of measurable electrical activity, not in terms of effect) contributions that we can't easily find with non-invasive methods in humans.