Watch for this signal

Want to know when your body starts to regenerate after an episode of stress? Here's a clue:

When you sigh.

 A child after crying: Sigh.

When you almost get hit by a car: Sigh.

When you receive your test scores and you have passed: Sigh.

 Let's do an experiment. Try to relax. Close your eyes. Disconnect from your surroundings.

Do you sigh? Tell me in the comments.