The NightWatch is a smart arm bracelet developed by scientists at Eindhoven University of Technology to capture the symptoms of severe attack including epileptic seizure, Tonic seizures, Tonisch-clonic seizures and Hypermotor seizures. It is capable to record accurate heart rate while the patient sleeping in night. It is also efficient to send a warning signal to a caregiver sleeping in another room when the device receives the systems of severe attack. Several tests for the accuracy of the NightWatch’s detection have been conducted by researchers at the epilepsy institutes Sein and Kempenhaege, which revealed the device detects far better than other alternatives. This is a good medical device for epileptic patients.