If you limit your fake traffic, then yes its fine. If you are reciving 1,000 pageviews / day, then overnight that goes into 100,000 pageviews - It looks obvious, although if you went from 1,000 pageviews, to 2,000 pageviews overnight, it looks fine because you may have just promoted your website/blog a lot that day/night.
Limit yourself with fake traffic 1:1 or 1:2 (real:fake)