Most of the symptoms you've all described in this thread, I've had. Your son may have a form of sleep Apnea.
This could explain why all the tests are coming out normal during the day but show a spike in temporal lobe activity during sleep.
Maybe you should speak to your Neurologist about sending you for a sleep study to determine what's causing your night temporal lobe activity and how many seizures he may be having during the night that you (your son)may not know about, causing him to be in a "postictal" state.
If this is the case, it could be very beneficial to other health probs.
Re Having seizures or active seizure activity during your sleep: Could be due to lack of oxygen to the brain while you sleep from sleep aids such as certain anti-epileptic drugs, sleeping pills, severe snoring or some sort of restriction to the airway.
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.
More energy when I wake up, better REM sleep, improved memory (less short term memory loss), and most of all ~ NO MORE NIGHT SEIZURES.
Diagnosed with Epilepsy & Ulcerative Colitis.
Current Medications: Diantin 275mg, Pheonobarb 150mg, Asocol 3,000 mg.