My son is 4 months with lissencephaly. he almost always gets seizures during sleep, or as he is waking up. could an eeg find out what kind of seizure?

Needs neurologist: Yes, with his condition he should be under the care of a neurologist, prefebly at a children's teaching hospital.

Infantile spasms: Since your son has lissencephaly, he may well have infantile spasms which are common for kids with lissencephaly and which often occur when children are waking up. An EEG would diagnose this. http://www.ninds.nih.gov/disorders/infantilespasms/infantilespasms.htm