Loud hovering noises at night outside our bedroom windowWe sleep with our windows open now that it's cooler out in the evenings & last night I was awoken by an extremely loud hovering noise. It lasted only a few moments (it sounded as though it was right next to us) before a loud noise followed WHATEVER was making it. It's hard to explain, but no aircraft here would make those noises. We are in a suburban neighborhood, planes cannot come that close to our houses. This is not the first time there has been something over our house/backyard. A month ago I was awoken at the same exact time because of a bright flash that flooded through our window & covered our backyard. It lasted only seconds before disappearing. I'm scared.