For much of human history, dark meant danger, and fearing it meant taking precautions to stay safe. As soon as night falls our anxious minds can come up with endless possibilities of the dangers nearby. Being the visually focused animals we are, ordinary, safe places (at daytime), can become a playground for creatures that transform into living beings that thrive at night.
I call them the Midnight Marauders.
These particular marauders lives in Bergianska, a park in the outskirts of Stockholm that I've walked through many times but becomes a radically different place when wrapped up in darkness.