You may have a form of sleep apnea.
Maybe you should speak to your Neurologist about sending you for a sleep study to determine what's causing you to feel this way.
Have any of your seizures happened during sleep? If so, this could be due to lack of oxygen to the brain while you sleep from sleep aids such as certain anti-epileptic drugs, sleeping pills, or some sort of restriction to the airway. If you have a 15" neck measurement, this could also cause an airway restriction. This could also cause nighttime seizures and/or a feeling of "post ictal" and headache, fatigue, or lack of energy.
This can also result in nighttime seizures.
In my case, I have been dx'd with Chronic Obstructive Sleep Apnea.
After my sleep disorders test the Dr. showed me the EEG from that one night, I would stop breathing up to 50 times/hour and had 3 seizures and that I was waking up "post ictal" (moody and spaced out) tired,lethargic, (feel like crap)
I have purchased a CPAP machine (Constant Positive Air Pressure)as recommended by my Doctor, which provides constant air pressure and have noticed a vast improvement.
No more snoring (the whole family sleeps better now), more energy when I wake up, better REM sleep, improved memory (less short term memory loss), and most of all ~ NO MORE NIGHT SEIZURES.