Since Yosemite, my iMac keeps going to sleep roughly every 10 minutes watching media

Since upgrading to Yosemite my trusty old iMac (mid 2007) keeps going to sleep roughly every 10 minutes whenever i'm watching media (either through a player or streaming online), regardless of power saving preferences. Everything else is working perfectly as it always has, as far as I can tell.
What am I missing? Are there new settings in Yosemite for this?

In addition to resetting the SMC as Link suggests.
You should also check and/or clean-vacuum the dust out of your iMac's air intakes to make sure that it is cooling properly.

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