Sweet Dreams describes themselves as Noisecore, Harsh Noise, Shitcore & Free Jazz (also dada on another section) in their facebook about section. I certainly hear the noisecore, harsh noise and shitcore here in Buio, I suppose the free jazz comes in later releases.
Buio is a harsh, pulsating release. It served to me as a lovely wake up call, harsher than any burnt gas station coffee. This for me is a fantastic introduction to Sweet Dreams, and makes me excited for things to come from them. Give it a whirl, you may crash your car or have some kind of medical situation.