Nocturnal Seizures @ 5:00 AM

Hi everyone, Hoping that someone here has some experience and can help me. My boyfriend has been diagnosed with nocturnal seizures for about 9 years, but they are controlled by medication. Basically, he can sense when they are coming on, he gets a "flushing feeling" his heart beat increases and he overall just doesn't feel well. Once he feels these symptoms, he's able to take his medication which calm his body down and he can usually sleep it off (8/10 it works, sometimes he feels sick the whole day). The medication does fully prevent the seizure from happening, but it doesn't help it from happening in the future. He takes medication everyday, and then this specific medication when he feels the seizure coming on. Usually his symptoms occur at the same time, around 5:00 - 6:00 AM. Has anyone else experienced this? Though they don't happen everyday and are isolated instances, they do occur on a quite frequent basis, at least 3-5x per month. Is this diet related? We thought that maybe gluten was encouraging these symptoms as i've read briefly about the Ketogenic diet, but I know this is intended for children. I also read that it can be blood sugar related, and that having something to spike your blood sugar levels can help as well. The weird thing is that i've taken him to emergency so that they can see him exactly when he's feeling these symptoms, but everything comes back normal. They take his blood, do an ECG, literally the whole 9 yards and they basically send him off on his way as if nothing is wrong (except for encouraging increasing his medication levels). I hope that there is someone on here who has similar symptoms and can help me in treating him in anyway. Thanks so much in advance!