Many people who have lived in the city - including me - experience a form of paranoia out in the wilderness. A lot of it is a projection, an anticipation of one's environment which eventually has to be equalized with a new environment if one switches over abruptly.
In civilized society we often digest the wilderness through a fanciful lens. Our senses are constantly assaulted with visions of disaster, avalanche, and attacking vicious animals, depending on one's media intake. But the reality of living out in the wilderness is much more nuanced, where a slight rustle is more likely just a rat or squirrel, but it can be taken as a bear that is about to attack.
Similarly there is biophobia and a fear of all manner of insects, noises and processes, which abates as one learns more about the nuance of the landscape. Most of it is harmless to oneself. The threats still exist, but not at the frequency that the city sensibility impresses. So the projections themselves attack one throughout the night, until one slowly re-establishes equilibrium with the environment again.
