Lamictal, altered sleep, and morning classes

Hi all. I'm 23 years old, and I was diagnosed with photosensitive epilepsy when I was 15 or 16 (I don't remember which). My pediatric neurologist went the herbal route, using CoQ10 and Feverfew (these did absolutely nothing for me). When I graduated out of the pediatric department, I started on Topamax, and had Keppra added to it for a while. I experienced very strong mood swings and precipitous weight loss from the Keppra, so we took that off. Just this past January, I have started the process of switching from Topamax to Lamictal (because of the horrible mental fog that I've had for about 5 years from the Topamax). I am now at 50mg Lamictal in the evening and 25mg each Topamax and Lamictal in the morning. Next week I will have completely switched over to Lamictal. My question is this: for the last few weeks I have had severe difficulty waking up in the morning. Most days I have slept into the afternoon (this doesn't seem to correlate to the number of alarms, volume of alarms, amount of sleep beforehand, etc.), thus skipping my classes. It's midterms week, and I don't know what to do. I know that Lamictal is commonly associated with insomnia, but do you have any experience of this opposite sleep problem? I am also on 100mg of Xoloft for depression, but that dosage has been consistent for months before this sleep issue started. Thanks