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).
If flat feet are contributing to secondary problems, especially leg or foot pain, treatment may be necessary. Flat feet can sometimes cause difficulty walking or running and interfere with athletic activities. A visit to a podiatrist will involve an evaluation of foot structure and function.