But what is a sleeper agent. >> A sleeper agent is someone who is taken virtually from birth and trained to be of another nationality. The Russians are very good with sleeper agents.No other country that we know of uses sleeper agents. Let's say you're born in Russia. from the age of, you know, two, they take you from your family with your family's acquiescence and they take you to an Americanstyle town that they've built out in the hinterland in Russia.They teach you to speak English with an American accen ...