My child has:decreased rem sleep & frequent wakings, migrational abnormality in brain that causes seizures, & behavioral probs.is all of this connected?

Very likely.: Sounds like a problem for pediatric epileptologist. Overnight full eeg with video monitoring might be very helpful. Maturational disorders are frequently associated with seizures, sleep disorders, and learning problems.

Yes, an underlying: Neurological impairment likely causes all symptoms. Seek evaluation by a developmental/behavioral pediatrician to search for a genetic or other medical cause. There are known syndromes with lack of rem sleep, the most common of which is down syndrome. Comparative genomic hybridization & a dna probe for fragile x are genetic tests used when there are no physical findings of a specific syndrome.