4. Hypnic or Hypnagogic Jerk
That moment when you’re drifting off to sleep but you suddenly feel that you’re falling off of a cliff and wake up with a jolt; a prevalent paradox experienced by 70% people of varied ages. This transpires due to muscle seizure between the transitional period of sleep and wakefulness. Scientists have revealed that hypnic jerk is not a psychological disorder; it is merely a materialization of stress, workload, and delusive light or loud noise coming from inside of the head, as reported by many who’ve occasionally undergone this innocuous phenomenon.