Essentially, it's about the desire to explore the world at night, when humans are usually sleeping, and strange creatures are up and about. Often, those who follow this aesthetic prefer to explore nature, but urban landscapes are also acceptable. They enjoy hiding when they can, away from others. If they could, they would find their way to surreal spaces like the Backrooms, and they like to wander forests looking for magical creatures. Some of the key values are solitude and freedom.
The visuals might include cryptids and forests, or foggy beaches without a human in sight. Other visuals might be small creatures like slugs, or mythical ones like unicorns. The visuals generally include strange, funny things that you don't normally see in human society, but might come across often if you're wandering the woods. Other visuals might even include small, comforting objects, like stuffed animals, even if the object is hidden away in a backpack or satchel.
Fashion associated is very comfortable, like oversized T-shirts and overalls, with perhaps something to carry things in, like a backpack. Clothing is usually in earth tones, though there might be some clashing bright colours. All clothing should be loose and unrestricting, in the case that one might need to run or escape as quickly as possible. It should also be warm, because in some places, nighttime is very cold. It doesn't necessarily have to be warm, though, especially if it's summer.
Nearly all of the activities from this aesthetic can be done on one's own, simply because this aesthetic appreciates solitude. Some activities might be collecting things from nature, or wandering the woods in search of mystical things, like a unicorn or a portal to another dimension. Even if one cannot do these, they still might enjoy taking walks in the mist, or hanging out at their local park at night, observing how the world is quiet there. Photography is also a key part of this aesthetic, so one can capture a moment in time. People who enjoy this aesthetic appreciate calm music, but some may also like bold, loud music.
I also have a few collections of photos that fit this aesthetic.