If your doctor wants you to have a video EEG — where you are monitored by a video camera while the EEG is in progress — you may need to have a short hospital stay. A video EEG is useful for providing a record of your EEG pattern during the exact time of any suspected seizure activity. Sometimes your doctor will ask for an ambulatory EEG, where brain activity is recorded for a longer period of time (usually 24 hours) away from the hospital.