[ubuntu] Ubuntu server sleeping issue

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http://ubuntuforums.org – So I am running Ubuntu server system 12.04.1 LTS on a studio laptop just to mess around with a site and stuff but I keep running into a small problem. If I dont do anything on the computer for like 10 minutes the screen goes black, not really a problem as it keeps everything going but if I try to connect to the site from a external source it appears to be down. The only way to "reconnect" it that I found is to connect to its local address with another computer on the router ( I assumed that the computer was shutting down the LAN or something to save power so I looked i (Hardware)