He kept going, trying to keep his breathing regular and even.

From within came no sound other than the regular breathing of the inmates.

He could hear the regular breathing of sleep behind it.

He was already asleep, she could tell by his regular breathing.

From the far side of the room he could hear her soft, regular breathing and smiled.

His deep, regular breathing came on its own now, without her instruction.

He turned on the bed and then his regular breathing began again.

From within came the regular breathing of a sleeping man - one only.

There was no sound, not even the regular, heavy breathing of sleep.

There was the sound of the sea, at a distance, like regular quiet breathing.