A system for remote surveillance of an EEG signal of a person susceptible of having a hypoglycemic seizure comprises an EEG sensor part with electrodes for measuring one or more EEG signals from the person, and a processing unit adapted to be arranged at the ear of said person. EEG signal processing means is adapted for analyzing the EEG signal, for identifying or predicting a hypoglycemic seizure in the person. The system comprises a first connection between the EEG sensor part and the processing unit, adapted for transmitting an EEG signal from the implantable EEG sensor to the processing unit. The system comprises an external part adapted to receive wirelessly an alarm from the processing part, where the external part is adapted to forward an alarm to a care-giver. The invention further provides a method of EEG surveillance.