The name is self-explanatory— dream journaling is the habit of writing down your dream, before you go on with your day and forget it. The benefits are reducing stress & anxiety, improving problem solving skills, and increasing self awareness.
This technique is all about keeping a record of your dreams, usually for the purpose of analyzing what your subconscious may be trying to tell you.
Our dreams are how our subconscious mind communicates with us, and the habit of dream journaling can be especially beneficial for deciphering those messages.
Dream Journaling Resources:
Books:
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