He had been unconsciously holding his breath for many seconds.

He stared at the image for a long time, unconsciously holding his breath.

Scott moved, releasing the breath he had been unconsciously holding.

I explosively let out the breath I'd been unconsciously holding.

Hal let out a great sigh, as if he had been unconsciously holding in his breath.

Firebird let out the breath she had been unconsciously holding.

They waited, and Garion found himself unconsciously holding his breath.

In his command chair, Picard released the breath he had held unconsciously.

Readis could hold his breath pretty well now and he had unconsciously held it just as they submerged.

Poledra sat at Belgarath's side, and the two of them were almost unconsciously holding hands.