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The Collaborative International Dictionary
Somnipathy

Somnipathy \Som*nip"a*thy\, n. [L. somnus sleep + Gr. ? a suffering of the body, fr. ?, ?, to suffer.] Sleep from sympathy, or produced by mesmerism or the like.

Wiktionary
somnipathy

n. 1 A sleep disorder. 2 (context archaic English) Sleep from sympathy, or produced by mesmerism or the like.