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).
Pes planus, or a flexible flat foot, is when the arch seems to disappear when the foot comes in contact with the ground. As the arch disappears, the ankle rolls inward. This ankle position is called pronation. Flexible flat foot is often diagnosed by specialists in the Institute for Sports Medicine.