It’s called bio sleep. And of course there are proofs of such a name. I can turn it on during the whole night and this beast is so quiet and calm that there was no situations when I got up early in the morning because of the noise from this air conditioner. To my mind, if you wanna acquire an air conditioner then you should certainly pick this one as it’s one of the most calm and quiet air conditioenrs I have ever acquired. Without a doubt, I support the company samsung in this way, because they create eminent products which help people not to be overheated by the scorching weather outside.