We have not enough knowledge.

Neither of us, I take it, has ever seen a case, and the extant descriptions are inadequate.

From what I know of the disease, its symptoms agree with those in your case in respect of the alleged moroseness and in the gradually increasing periods of lethargy alternating with periods of apparent recovery.

On the other hand, the disease is said to be confined to negroes; but that probably means only that negroes alone have hitherto been exposed to the conditions that produce it.

A more important fact is that, as far as I know, extreme contraction of the pupils is not a symptom of sleeping sickness.