A system for remote surveillance of an EEG signal of a person susceptible ofhavinga hypoglycemic seizure comprises an EEG sensor part with electrodes formeasuringone or more EEG signals from the person, and a processing unit adapted to beremovable arranged at the ear of said person, and having EEG signal processingmeans for analyzing the EEG signal, where the signal processing means areadaptedfor, based on the EEG signal, identifying or predicting a hypoglycemic seizurein theperson. The system comprises a first connection between the EEG sensor partandthe processing unit, adapted for transmitting an EEG signal from theimplantable EEGsensor to the processing unit. The system comprises an external part adaptedtoreceive wirelessly an alarm from the processing part, where the external partisadapted to forward an alarm to a care-giver. The invention further provides amethodof EEG surveillance.