I'm a dill (that's ozzie for idiot). I thought the bios functions controlled when the PC slept, of course it isn't (when I thought about it hard enough) it eventually dawned on me that the o/s (win7) was doing it. A cursory search found the hibernate control, and one of the options was, of course, never. Apologies for wasting everyone's time.
Thanks again, especially bilbat for replying.