Scary dream and health effects. It must raise your blood pressure enormously?

It can. Sympathetic surge which is the panic or heart racing that you feel whether waking from scary dream or sprinting down the street can raise blood pressure significantly. If blood pressure is an issue, i recommend taking your blood pressure after an episode or early in the morning when you wake to see it is controlled. If not, discuss with your doctor. Can be a reason to suppress dreams with rx.