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Usually, when I sleep as a ghost, I don't dream. I can only feel the faint darkness seep into my mind as I am embraced by this cold and unforgiving obscurity. The nature of my very soul has changed greatly, and despite still having the ability to rest and calm my mind from its stress, I cannot possibly sleep the same way living beings can.
Of course, I can still rest and the next morning wake up energetically, but essentially, I cannot sleep normally, and therefore, dreams do not exist in my sleep.
I only feel as if I've fallen into complete silence and obscurity, although a part of my own self remains awake at all times, seeing and experiencing the world around me through the phantasmal capabilities of my very existence.
Being a ghost is rather interesting in many peculiar ways, which I had yet to delve into to its full extent. Despite this, I had realized many things by merely existing and developing my strength.
Check "The Protagnist's Sister Is Actually the Strongest"!