I fell asleep and started dreaming inmideatly. i woke up suddenly and couldn't move, and it felt like an earthquake and a horrible sound. what was it?

Sleep paralysis: This occurs at the transition from sleep to wake. There are a few stages of sleep, one of which is a rapid eye movement (rem) sleep in which you dream. During this stage, you also don't have muscle tone (atonia). It can occur because of the intrusion of disrupted rem sleep onto wakefulness. If you experience it often, it may point to a condition, ; it is recommended to see a sleep med. Specialist.