agree with ardensmom, I am 44, and as a child i had sleep eeg's to show massive peti-mals, as i grew up they changed to grand malls, yet appear different, when i was a child, they made me stay up 24 hrs prior to eeg, when i got older, they only did one sleep eeg, and a few (in office)eeg's. It seriously took me having one right infront of the docs, following an unrelated surgery, for them to one, believe me(and my husband, etc..) and two, diagnose grand mall, and send me to a mayo clinic specialist, who in return found i had the 2nd only in his carreer with this type of sz'z. persiverre, you will win.
My daughter with rolandic epilepsy had 2 normal EEG's until the 3rd one- she fell asleep during, then her seizure activity showed itself. Persevere, ask for follow up on the MRI. EEG's aren't always going to show anything.