Fact 1: Healing requires rest.

Fact 2: And, after a full day, relax to a sound and restful sleep in the cool, fresh mountain air.

Given the two facts above, answer the question "Healing requires what kind of sleep?" with the following options: 
- disturbed
 - frustrated
 - fitful
 - sound
 - good
 - slow
 - Energy.
 - energy


 

    sound     