By narrow window, you mean gaps between clouds?

East coast of Spain, been cloudy all day, forecast for rain Friday morning, but to my surprise the sky seemed clear at 5am here (4:00 UT). Set up camera, but within 20 minutes sky totally covered with cloud again. It did clear in patches by 4:40 (UT) , but camera caught nothing through the gaps. Visually I did see one meteor, but by it’s direction it was most likely a Leonid.