Encephalitis Lethargica?

I remember when I was quite young my mother talking to someone about how my great grandfather, or possibly my grandfather, having had sleeping sickness. I remember the tse-tse fly being mentioned. I believe it was when my mom was going to Pearce College and studying biology. I also think she was guessing that he had had African Sleeping Sickness but nobody knew for sure.

Did he have Encephalitis Lethargica? What are the chances that I had an older relative with an obscure brain disorder and now I have another totally unrelated obscure brain disorder? I wish I could get at some medical records.