If you are not planning on cutting your sugar cookies into shapes, you don’t necessarily have to refrigerate the dough- you can just place the dough on the cookie sheet and bake right away. However, if you are going to be cutting out shapes you definitely need to refrigerate it. I did not do this the first time around and the dough was really sticky and mushy and I could not form shapes or even roll it out. I ended up adding more flour instead, but this just made the cookies taste really flour-y and not good. Don’t add more flour if this is the case, just refrigerate the dough for longer!