The sensation only built and intensified until it pushed the dreaded words from her mouth.

When she rose to pace, the sensation of suffocation only intensified.

The sensations intensified; now he felt as if he were going up and down across long, slow waves.

But sometimes a single sensation slowly intensified.

And that sensation intensified as her companions boarded the craft.

When he closed his eyes, the swaying sensation intensified.

Ten meters away, the sensation intensified, rapidly becoming painful, as though the insects had begun to devour his flesh.

That sensation of deep, baking heat intensified.

She tried to ignore it, but the sensation only intensified as her body gave way to the moment.

The sensations typically begin or intensify during quiet wakefulness, such as when relaxing, reading, studying, or trying to sleep.