Less

When you live in a bright place, you get used to light, and it starts affecting you less.
When you live in a dark place, you get used to dark, and it starts affecting you less.
When you live in a violent place, you get used to violence, and it starts affecting you less.

And when you skydive enough, you get used to gravity, and it starts affecting you less.

This is nowhere near as pleasant as it sounds.