What is a dream journal?

Getting Started

It's simply a place where you write down your dreams right after waking up. Could be a notebook, an app, a voice memo on your phone. The key is doing it before the details slip away. Over time you end up with a personal archive that makes it easy to spot patterns, recurring symbols, and emotional threads you'd never notice otherwise.

Sources

https://dayoneapp.com/blog/dream-journal/
https://www.sleepfoundation.org/dreams/dream-journal