Answer to Question 1
A power nap of about 15 to 20 minutes can boost mood, motivation, and performance; lower stress; and improve memory and learning. Some people use power naps when they don't get enough sleep at night.
Answer to Question 2
Physical activity increases levels of KAT, an enzyme that helps rid the body of a stress-induced amino acid (kynurenine) associated with depression and other mental disorders.
