My brother had rented a house that was built over a native american burial grounds here in Maine and you couldn't make up the stories he told me that happened at night in that house, He had to move out after a few years to keep his sanity.........
I still have plenty at work in the mill....lol, Probably why the pest have become more prevalent in some areas, You can see them feeding at dusk on the insects up here.
We opened my oldest sons in ground a week ago this past Tuesday, Solar roof heater, Solar cover, 71°F today and that's after back to back mid 30's nights.