Fill in some teA rare genetic disorder affecting the nervous system,xt

Frequent smiling, laughter, hyperactivity, seizures, and severe speech impairment.

Caused by a missing or malfunctioning gene on chromosome 15, specifically the UBE3A gene.

Happy demeanor, frequent laughing, and excitability are characteristic traits.

Children often experience disrupted sleep patterns and may sleep less than usual.

Angelman Syndrome,