sleepers.

If he has truly disappeared, it could further complicate efforts to probe the London recruiting network that apparently swept up Moussaoui, Reid and other suspected terrorist "sleepers."

The Shoe's Tracks 2007

These linear features have been interpreted as the remains of floor joists or "sleepers."

Interactive Dig Mt. Vernon - Dig Diaries: Report 19 2003

You know that a deficiency of boron will cause trees to go into a condition which the growers out there now call "sleepers."

Northern Nut Growers Association Report of the Proceedings at the 41st Annual Meeting Pleasant Valley, New York, August 28, 29 and 30, 1950

Anyway I'm camping here for the winter, an 'during that time I'll need to wake some of these' sleepers. '

The Heart of Unaga Ridgwell Cullum 1905