Green lacewings usually appear about this time, looking for somewhere to hibernate. They turn from green to pale brown for the winter, perhaps to make them less conspicuous in the woodpiles and heaps of leaf litter that they SHOULD be over-wintering in. Instead they’ve chosen the kitchen ceiling and as they climb upwards, there are now scores of them clustering around the top rim of it. They moved in en masse during a mild spell last weekend (Nov 5/6). Now the house spiders have noticed them.