The second sought to uncover the relationship between sleep and pain.

The parents dressed quickly as their two children drifted between sleep and fear.

The time between bed and sleep was the worst of the day.

This may be an indication of a link between sleep and learning.

Caught between sleep and aware, she obviously didn't remember what had happened that day.

Curtis could tell she was still halfway between sleep and listening to him.

Not enough is really known about the mysterious relationship between sleep and diet.

In dreams, or that moment between waking and sleep, there is my voice.

It must have been early evening, probably between dinner and sleep.

There's not much difference between sleep and unconsciousness right now.