Going to sleep while watching a video

I apologize if this has be addressed before but all I could find were problems putting the computer to sleep and I am a newbie so bear with me I installed Frodo on my win8 tablet and while watching something on Hulu after about 10 min. My tablet went to sleep. Is there a setting in xbmc that will prevent sleeping while something is playing? I am ok if it goes to sleep while idle.

Thanks,
Scott