I take Lamictal (1000mg) by itself.  I take other meds but not for seizures.  My seizures do not occur at night, as far as I know.  I've been taking it for quite some time.  I have had breaktrough seizures while on it.  I have to take high dosages of any med though.  My body simply metabolizes the meds to quick and they are filtered before they get in my system. 

I never had a seizure on dilantin but I quit taking it within a year of starting because of the side effects.  Lamictal is a great drug in that there are no severe side effects.  I've never felt "drugged".  The higher dosage does seem to come with some nightmares and the occasional morning sickness.  If I wasn't a guy, I'd swear I was pregnant sometimes.  If the Lamictal seems to be working alone, I would stick with it.  Even though I still have the occasional seizure, I am happy with the results. 

A lot of doctors don't full explain Lamictal levels.  The efficacy levels are from 4 to 22.  You really want to be above 10 or so.  The original dr. that put me on it seemed to just wait until I had an episode then up the dosage.  My present neuro explained the levels and put me on a dosage that would keep me in range.  My seizures are minimal and I know a few people that take Lamictal ONLY and haven't had a seizure unless they came off their meds.  It seemed to give them false hope that they were seizure free untill they stopped taking it then back on the meds and all is well.