(Cheryl of the Clue Crew monitors a sleep study at the Sleep Research Center at Stanford University.)  Doctors for this center linked dreaming with this phase of sleep that includes higher heart & respiration rates
Decreased salivation Increased respiration Increased heart rate 
Digestion... [DOC] [TLE] The Willpower Instinct: How Self-Control Works, Why It Matters, and ... [PAR] But saying no is just one part of what willpower is, and what it requires.