His eyes closed and he sank like a stone into sleep.

Her eyes drifted closed and she sank into a natural sleep.

Instead she took the path of least resistance and sank into a deep sleep.

Finally, some time before dawn, I managed to sink into sleep.

I sighed, and sank into a sleep that was deep, but almost normal.

And then, holding him in her warm embrace, she sank into sleep.

He shut his eyes again, willing himself to sink deeper into sleep.

He'd stared down at her lying still, sinking into sleep.

Even as he sank into sleep, a part of himself remained conscious.

At daybreak he felt himself again sinking into a deep sleep.