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).
Flat Feet. Flat feet are just as they sound - feet that are flatter on the undersurface (or plantar surface) than they should be, because the arches (insteps) have dropped. This can (but does not always) lead to pain and tiredness in the feet. It can also cause problems in the ankles, legs or back.