Why does my iMac screen continually wake up when streaming movies?

Whenever I stream a movie from my iMac to Apple TV, my iMac attempts to wake up every few minutes.  It is in the same room as my tv, so it is distracting especially at night when the login box constantly pops up.  Until a few months back I never had this issue.

The computer needs to wakeup in order to play the movie and interact witht the files in your iTunes library.. it's either this or the appleTV will get an error.. and you'd need to walk over to the computer and wake it up manually.. i have a mac mini and i just turn my screen off.. not sure if there is a way to just disable the screen itself on a iMac but that is what you want to do.. but the iMac really does need to wake up to interact with the appleTV.. as i said.. you can have this happen automactically or the other option is to manually walk over the the computer and wake it up everytime you appleTV gets an error because you computer is asleep..

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