I manually pause campaign, there are two options when you start a new campaing, something like default settings and advanced one, so in advanced one there is time scheduling, but in the simple one there isn't such option. In fact, every time i start a new campaign the PPC price is higher in the first 2-3 days. On facebook I never run any campaign because you don't get such targeted click as with adwords, so i can not help you on this one, just wanted you to know that a least in my case this is the thing with adwords, cheers mate.