A 69-year-old non-corpulent Japanese man with obstructive rest apnea disorder (OSAS) whining exclusively about night sweat was dealt with effectively with consistent positive aviation route pressure. Nighttime perspiring of a typical side effect of OSAS is additionally brought about by drugs/liquor/heroin, malignancies, contaminations, gastro-esophageal reflux, and endocrine/rheumatologic sicknesses. Family doctors ought to incorporate OSAS in the differential analysis of this indication.