HDMI wakeup is normal. You can get little HDMI cables or adapters with the CEC pins removed if you want to stop it passign commands to that TV.
Otherwise try changing ports around on your HDMI splitter. Ones that dont specifically support CEC will usually only pass it to one of the ports since multiple displays on it make things go crazy.
Most likely something passing via hdmi then as the mysky wakes up. As @richms says, it will be a matter of trying different hdmi settings until you find the one responsible.
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