sleeper nest is a noun meaning "a nest of sleepers awaiting a prearranged signal". It carries one recorded sense.
a nest of sleepers awaiting a prearranged signal
“sleeper nests of Islamic terrorists were capable of launching major attacks in Europe”
Definitions, synonyms and semantic relations for sleeper nest come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.