Where does “nystagmus” come from?

nystagmus (Latin) comes from Ancient Greek νυσταγμός, from Ancient Greek -μός, from Proto-Indo-European -mós — Creates action/result nouns from verb stems.

Ancestry of “nystagmus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	νυσταγμός	drowsiness
2	Ancient Greek	-μός	Forms abstract nouns
3	Proto-Indo-European	-mós	Creates action/result nouns from verb stems

Every word from Proto-Indo-European -mós →Every word from Ancient Greek -μός →Every word from Ancient Greek νυσταγμός →