Unknown electric shock felt underfoot & elbow

bold

Unknown electric shock is felt under my foot & elbow...
(describe like cattle prod)
Jarred my leg to kick & enabled arm to swing...
Uncontrollable, once each time it is felt...
Right before entering into full sleep...
Anyone know *WHY* this happens...?
Please, share your insight with me...
Thanks...
*~*JOY*~*