The carotid sinus is located in the carotid artery in your neck. Sleep and coma and seizure are other forms of loss of consciousness. If you have a seizure, you may experience a loss of consciousness which differs from syncope. A seizure is a convulsion that is caused by sudden abnormal electrical activity in the brain. Most often seizures are caused by epilepsy.
Seizures vary in type.
Some forms do not cause a loss of consciousness. You are more likely to injure yourself from a fall due to seizure than from one due to fainting, because your protective reflexes are still at work during syncope. Urination is more frequent with seizures. You will regain your consciousness faster if you have fainted than if you have had a seizure. Mental confusion, headache and drowsiness are more common after seizures than after syncope.