You should have a sleep study done, preferrably from a board certified sleep specialist, who specializes in neorology. I have grand mals in my sleep, and have been on dilantin for years. I'm a heavy snorer (female!) , and had a sleep study done 10 years back that was inconclusive, so I tried to ignore my symptoms until I was falling asleep everytime I sat down. I have had many eegs in the past, all normal. I finally had another sleep study done, and found out I was waking up 83 times an hour, due to stopping breathing at night. Since I've started CPAP ( a machine you sleep with that forces air into your throat and keeps your airway open ) I have not had any grandmals, and have greatly reduced the number of "stare out " seizures I was having. I have a machine that tells me how many apneas I have an hour, and when the number gets a bit high, I may have a small seizure or two. Many people who have nighttime seizures have them because of sleep apnea. The oxygen in their blood gets too low , and causes the seizure. The only way to tell this is going on for sure is to have a sleep study done. By the way, you don't have to be overweight, or snore heavily to have it. I still use the dilantin, but I hope once my apnea gets controlled I can get off of it or at least cut down. Good luck. Virginia