#20 Exploding Head Syndrome
Most people have experienced waking up to a large bang, a bright flash of light or an unfathomable sensation where it feels that their head exploded. However, in reality, nothing has actually happened.
These illusions are the results of a phenomenon called exploding head syndrome, which is similar to a hypnagogic jerk. It occurs when you are drifting into a deep sleep while the body is still in its senses.