This little succulent spent the summer out on my enclosed porch. It wasn’t its first year out there.
But for some reason, at the end of the summer, it started to lose its foliage (if that’s the correct term for these sort of stick like succulent limbs).
I just stopped all moisture for about a month and brought it into the house, unsure if excess water, humidity, or some combination had gotten to it.
As you can see by new growth, whatever affected it has stopped. It is putting on new growth–even in our winter.
The last couple of years, it has flowered in early spring. We’ll see if it can recover enough to do that.
Gardendaze 
It seems to be a Euphorbia tirucalli, or pencil cactus Although not really a cactus, the green stems function just like the green stems of cactus, so need no real leaves. It looks very different from how I know pencil cactus out in landscapes. It could be a cultivar that I am not familiar with. I am not aware if it dies back naturally every so often.
You grow pencil cactus in the landscape? What a concept. I actually have 4 of them, all slightly different cultivars (none of which were labeled of course when I acquired them but one has very cool squarish stems and another is that one they call Fire sticks, I think because it’s reddish). None of the other 3 has done this but that doesn’t mean anything necessarily. I suspect it somehow just got too wet–& luckily recovered.
Karla