My brother is being tested for chorea- neuroaconthocytosis but the diagnosis hasn't been confirmed yet. Is there anyone who has a sleep disorder in addition to the other symptoms?

My brother is 47 now, and has had symptoms for about 6 years but diagnosis hasn't been confirmed. The first signs were subtle behaviour changes with uncharacteristic actions and loss of inhibitions. Then he developed a sleep disorder with excessive daytime sleepiness which has persisted in spite of medication. The other symptoms of balance and swallowing problems, slurred speech, chorea and dystonia started later and are getting worse. His blood tests so far have been negative for acanthocytes, but I know they can be absent in some cases. His blood has been sent to Germany for Chorein testing. I would love to speak with anyone else who has experience of this. Thank you.