What could cause sudden death and/or sudden temporary paralysis in a human body?

Congestive heart failure is a serious condition in which the quantity of blood pumped by the heart each minute is insufficient to meet the body's normal requirements for oxygen and nutrients. Any disease that affects the heart and interferes with the circulation can lead to heart failure.

The paralysis may be from lack proper blood flow threw the body this could have something to do with a persons heart.

The hearts primary functions are to supply oxygen to the body and to rid the body of waste products(carbon dioxide).

The symptoms of heart disease include certain types of pain, shortness of breath, fatigue, palpitations, light headedness, and fainting.

Any of these can cause death or paralysis.......................................

Stroke

Trauma

Polio

Blood flow

Amyotropic lateral sclerosis

MS

Guillian-Barr syndrome

My cousin had an autoimmune condition that has about 100 words in the name that I can't remember, that caused sudden paralysis. 

It's been 4-ish years and she has regained most of her mobility except she has some residual nerve damage.

She had massive amount of steroids that "broke" the paralysis. 

The only cause of death is the heart stopping pumping. No heart beat.

Death.

the vulcan death grip . 

🥴

Cardiac arrest. Sleep paralysis. Strokes.