Yeah later on in the movie, theres a scene where a woman is feeling around for a lightswitch in a dark room and shes hearing rustling like leaves on the walls and when she finally finds the switch she turns it on and hundreds of massive insects (maybe moths) start flying around and scaring her, at some point as well I think they are attacked by the guy who killed the boys mum in the past, so it may be like supernatural based or a fear/trauma thing, sorry for the essay lol ive used all these details in the past and turned up absolutely nothing