Catrin, Count on the sleeping bag to be good for 40+ degrees ... From the research I've done, the bags are usually 10+ degrees off (colder). Wouldn't hurt to err on the warmer side by bringing your wool. :-)
Good I got the more expensive sleeping bag then...I suspect that a trip to Good Will will be in my short term future as well, I just realized I've no jacket that actually FITS me, not one for camping that is