Palpitation is an awareness of the abnormal beating of the heart. It may occur in people with or without heart problems. Heart palpitations when lying down is not a common occurrence and can be caused by various factors.
Flat feet occur when the normal foot arches have partially or completely collapsed. When the foot is put to the ground the inner or middle side of the foot comes down to the floor rather than remaining raised. This can cause the whole foot to roll inwards (this is called over-pronation).
Excessive Pronation. Excessive pronation is a condition where the foot rolls inward (toward the arch) and the ligaments and tendons at the back of the heel are stretched too much. This can occur when injuries to the back, hips, or knees change the way you walk.