Dawn of the Vermin

This is just a quick post about a phenomenon I've noticed lately. After a relatively calm winter and early spring, the last two weeks have been absolutely infested. I've seen and heard about cases of cockroaches (two dead ones in the hall) mice, spiders, giant flying unidentified buggy-thing, and suchlike. Why all at once? What is the message in all this? What is the frequency of so-called little visitors trying to tell us?

Perhaps I should clean my room...