<unk>  is an ultra-rare neurological disorder named for the transient episodes, often referred to as "attacks", of<unk>  (weakness or paralysis) from which those with the disorder suffer. It typically presents before the age of 18 months. These<unk>  attacks can cause anything from mild weakness to complete paralysis on one or both sides of the body, and they can vary greatly in duration. Attacks may also alternate from one side of the body to the other, or alternate between affecting one or both sides during a single attack. Besides<unk> , symptoms of the disorder include an extremely broad range of neurological and developmental impairments which are not well understood. Normally,<unk>  and other associated symptoms cease completely with sleep, but they may recur upon waking. Most frequently<unk>  is caused by a spontaneous mutation in the ATP1A3 gene. It is an extremely rare disorder – approximately 1 in 1,000,000 people have<unk> . It was only recently discovered, having first been characterized in 1971.
Alternating hemiplegia of childhood
Chronic paroxysmal hemicrania
Acute cerebellar ataxia of childhood
Ataxic cerebral palsy
Dyskinetic cerebral palsy
Babinski–Nageotte syndrome
Non-progressive congenital ataxia
Infantile progressive bulbar palsy