Driving me nuts

I have a gang of magpies on my roof that sound like a bunch of football hooligans with rattles. They seem to be giving alarm calls all day and night, starting at about 4am. The birds do not seem otherwise disturbed or agitated. They just hunker down on the aerial on the roof near by bedroom window all day and do this. At night I am dreaming that Velociraptors are coming to get me.
Is it an alarm call?
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However, I've seen The Birds so I know I might be wrong
Come to think of it, it was after our supper and still light, so it would have been about this time of year.