piss and sweat...
But mostly p1ss, no ...? "Total water loss by both routes for an average healthy young male averages about 25 milliliters per hour, or 200 milliliters* per eight hours of sleep"*1/5 litrehttp://www.washingtoncitypaper.com/columns/straight-dope/article/13040026/straight-dope-do-you-really-sweat-one-liter-each-night