Presumably that's because the poking-out bit of house containing your spare room and my bedroom casts an enormous shadow on the window of your bedroom at that time in the morning? Not sure it'd work so well in my case, though, because the poking-out bit doesn't have another floor above mine to cast more shadow.

Anyway, the noise from next door would be far worse than the morning sun for keeping me awake, so I wouldn't want to swap...