sleeper

2. A heavy piece of wood or concrete that holds up train tracks.

Workers replaced the old wooden sleepers under the rails.

3. A train car with beds for sleeping on long trips.

We booked a sleeper for the overnight train to Scotland.

4. Something that is surprisingly successful after people did not expect it.

The little movie became a sleeper hit at the box office.

5. A small earring that sits close to the ear.

She wore tiny gold sleepers in her ears.