I have data on this Being without gf (home alone) decreased my recovery by 17%, my sleep by 4% and my resting heart rate by 1% But it also increased my productivity by 31% Kind of expected, gf keeps me healthy and if I'm alone I work harder The more data I collect the more it sticks out though that flying long haul to conferences is the worst thing I can do to my health! http://caltrack.levels.io