Can I rest my Ciabatta dough overnight?
Resting it in the fridge overnight ought to be absolutely fine, I've found that in general I get better flavor from a slower rise. I'm not sure that refrigeration is going to help with this folding technique though, it's going to make the dough less sticky yes, but it will also make it less flexible. 

With cold dough I'd oil a work surface and my hands and gently stretch it and fold it that way. I think the goal of the folding technique is to avoid handling it too much and knocking the air out of it, and this may work as well. I use this method for focaccia, which is also very sticky, although I only fold it to get flavored ingredients into it. 

Let us know how it goes.