My mature obesums don't sleep in winter. They do slow down as they are kept outside and winter temps regularly dip down into the 50's °F at night. However, they continue to put out new leaves and even bloom.
I do not let them get dry. If the top inch or two of soil is drying out, I water.
Of course, Tarev, you have a much different climate there than we do here, so YMMV.
But since my Adeniums continue to grow and bloom during winter, I expect if they were kept warm 24/7 they would grow faster. My opinion, of course. I don't have a heated greenhouse or climate-controlled space where I can grow Adeniums during winter, so this is all conjecture on my part. Relative humidity may also play an important role in dormancy/semi-dormancy in winter.
Ken, you'll have to keep us apprised of your Adenium's progress through winter. Take photos to document! It will be really interesting to see how your Adeniums progress climate-controlled during winter.
