(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
[DOC] [TLE] HealthDay: February 2014 Archives - CAHBA [PAR] Feb 28, 2014 ... "Previous imaging studies have suggested that sleep disturbances may be .... 
Children's Hospital Congenital Heart Center, said in a university news release.