Why do I hold my breath when I'm concentrating hard?

Picture this: your pod is deep in a hard problem, deadline close, room silent except for typing. Nobody is breathing well. You find out only when you sit back and gasp, like surfacing from water. Here is what is happening. Attention is limited. When it fixes on a screen, a number, a difficult sentence, it pulls your awareness away from the body. The breath keeps moving, but no one is watching it. It shortens, catches, sometimes stops. You only notice when the body overrides you with a gasp. In a group this pattern spreads. One person's held breath sets the tone; the whole room tightens without knowing why. The fix is not to try harder to remember your breath. It is to build small, shared checkpoints that catch the hold before the gasp does.