You're welcome Kate! It also took me awhile to understand this, since I thought all succulents are more active in summer. Well, apparently not in my area since we get into the extreme side of heat and dryness.
Oh I have also killed young Adeniums, lesson learned, that it requires a bit more moisture than the older more established ones but still giving it intervals in watering since it is in a dormant phase. Oh well..live and learn.