Answer: Epilepsy.
Step-by-step explanation:
Epilepsy is a brain disorder characterized by repeated seizures, it occurs when there is an abnormal electrical discharge by the brain, this leads to a change in the behaviour of the victim without the victim been aware of the happenings.
Abnormal electrical discharge is caused as a result of certain drugs, fever, brain injury, infection and shortage of oxygen to the brain, etc. For one can be diagnosed of epilepsy, such person must have had not less than two seizures.