If your TV is turning on and changing to another channel off of the 3 its always set at, this is something programmed inside the TV to be causing this. You would need to go through your TV's menu to turn this option off. Not knowing anything about your TV brand I can not provide you a step by step on how to do this.
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Unfortunately the cable boxes do not have a wake up timer just yet. Its a popular request, so having said that, try to go through your tv menus and see if you can find a wake up timer. You wont find it in the cable box menu, so make sure you are looking at the tv menu. This is a good site if you want to find your tv manual. http://www.retrevo.com/samples/TV-manuals.html