Macbook pro sleeps when I try to watch an iTunes video

Why does my computer go to sleep when I try to watch a video? I used to be able to watch any program I've downloaded and the computer would not go to sleep, nor would the screen dim, even though my computer is set to sleep after 10 minutes.  However, since the latest iTunes update, my computer goes to sleep within 5 minutes of my starting to watch a video.  I can no longer watch a podcast, movie or tv program I've downloaded without jumping to wake up the computer EVERY 5 MINUTES.  It's so annoying.    How can I set the computer to not go to sleep when I use iTunes, but will sleep when I'm not using the computer?  This problem only happens on my MacBook Pro 13.  It doesn't happen on my other computers.
I tried trashing the iTunes preferences, but that didn't solve the problem. 

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