This will sound crazy. My martial arts instructor taught his class to do a body check every night when you lay down before going to sleep and again in the morning when you wake up. Basically close your eyes and feel your heart beat in your finger tips and toes. Please note I was also studying meditation and Yoga at that time. As I practiced this "body check" daily I realized something. When the heart beats it does not only push blood. It sends an electrical impulse through the blood to every part of the body. I literally felt that. This is the first time I ever heard of science proving what I felt.