There is an airport very close to Redeemer. I've been finding lately (as essay season is going and exam season is coming) that this airport receives planes at the most awkward time.
Between 1 and 2am (it's 10 minutes to 2am right now) is rush hour for the airport. The planes can't land at normal times during the day, like when there's light outside, not at all! They have to make the most noise during the hours students are either trying to get to sleep, or finish essays.
My favourites are the big ones. They make the most noise and, sometimes, it'll sound like the sky is falling down.