I have a dog with epilepsy, it usually comes on around the age of 5 yrs, and they have a distinct character change before the siezure, this is what the vet told me anyway. My boy is on medication, and has a siezure once a month but only very mild now, he just looses his balance for about 2 mins then he is completely normal. He doesnt have a character change now b4 the siezures either, only b4 the first one and it lasted 3 weeks, we thought he had something wrong as he was very anti social, but after the siezure, like within 5 mins he was his happy old self.
When humans have a siezure they are generally very tired afterwards, i am lucky enough to have a human with it too. My dogs first siezure made him very tired, but from then on he wasnt so bad, and the next siezures werent as bad either.
My boys siezures are bought on by excitement/stress, and exercise, they will usually have a siezure in the evening too, dont know why, but this is how it generally happens, my boy usually has his at dinner time, around 8pm. He will have a siezure eat his dinner as long as i hold him up and continue to have the siezure, he just thinks he has a balance problem for a few minutes, the poor boy only has 3 legs so its hard for him. His siezures are minor now due to the medication, dogs medication unlike humans does not completely stop the siezures, they just reduce the occurance and severity of the siezure.
Dont know if this is much help but maybe.