Seizures remain present in adult patients, but hyperactivity, short attention span and sleeping problems improve.
[orpha.net]
Angelman syndrome combines severe mental retardation, epilepsy, ataxia, speech impairment, and unique behavior with happy demeanor, laughing, short attention span, hyperactivity
[ncbi.nlm.nih.gov]
Other signs that have been described include a happy demeanor, hyperactivity without aggression, short attention span, excitability and sleeping problems with decreased need
[orpha.net]