Right now I'm downloading Team Fortress 2 using Steam, and the download time was a whopping 14 hours. I'm worried about my laptop overheating if I leave it on that long, so is it possible that I could just let it download for a while, turn it off, and the next time I turn it on, continue downloading it? Would shutting it down pause it, or stop the download and force me to re-download it again? Also, if you leave it on sleep mode, would it continue downloading? I use Windows 8.