How many silverfish must you see in order for it to be called an "infestation"? Years ago I saw them frequently in the summer, but never in the winter. In recent years, I've seen them in the winter too (although not as frequently in the summer) - must be global warming. In the summer, I see maybe an average of 2-3 per day around the house. Not that I'm actively searching for them, so there's probably a bunch that I don't see crawling around. Is it normal to see them everyday?
A few times in the last few weeks, I have even been woken up suddenly by a ticklish feeling on my arm, to find a silverfish crawling on me!