If there is a rapid heartbeat upon waking up in the morning, it could be due to anxiety. The heart's response to stress, which is due to anxiety, is an increased heart rate.
Stress refers to a person's physical or emotion tension, which can be triggered by any event that makes him nervous, angry or frustrated. Little amounts of stress can prove to be beneficial in accomplishing tasks. Anxiety refers to a person's feeling of worry, unease and fear.
A healthy lifestyle can assist in lessening stress or anxiety. Eating a healthy diet that is rich in vegetables, whole grains and fruits and performing regular exercise are part of a healthy lifestyle. Restraining from taking too much caffeine, tobacco and alcohol is also important.