Not being an iPhone person (I am an Android user) all I could do was Google around and find tons of hits about this particular IOS bug that occurs around the turn of DST on or off. But it's not clear which IOS release I need to apply to fix it so we can both get uninterrupted sleep!
Her phone appears to be on 4.1 and we don't upgrade firmware much. In fact the phone is hardly ever connected to a PC. Is this particular bug fixed in any particular firmware release?