I know about sleep paralysis and there is several information about it, available over literature.
Sleep paralysis is a temporary inability to move or speak that occurs when you're waking up or falling asleep.
But I never read about sensations of some electric current passing through an individual as shown in this figure from top to bottom during sleep. It doesn't comes under the category of sleep paralysis.
When I searched over internet , I found almost no proper material to read science behind it.
Is there any research done on (or at-least recognition in literature on existence of) such sensations while sleeping?