how can I make my computer only recognize my network and not that of one of my neighbors?

How can I make my computer only recognize my network and not that of one of my neighbors? This is for when I am at home, and everytime the computer goes to sleep it essentially loses the connection, only to pick up my neighbors network when it is awaken.

I am on Comcast (Xfinity) Highspeed Cable wireless modem/router

Thanks in advance!

Mark