iMac comes out of sleep by itself

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I put my iMac to sleep and just now it came out of it by itself and then went back. Has this happened to anyone else and can you tell me what's going on? Is this normal?
 
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Mac Mini (Late 2014) 2.6GHz Intel Core i5 Memory: 8GB 1600MHz DDR3
Something is running that's waking it up. Check your Activity Monitor.
 

iWhat

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I've had this happen to me as well, so you are not alone. I've nearly fallen asleep only to be awaken by a piercing light shining through my eyelids, not fun!

It only happens rarely though. But I do leave a few applications open all the time, none of which repeatedly wake up my mac. Another thing, you might need to consider is what peripherals you might have connected or network activities that may awaken your mac. If it constantly happens, I'd just restart the computer, if it's been awhile, since the last one.
 
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Try turning off the mouse and keyboard worked for me
 

pigoo3

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I put my iMac to sleep and just now it came out of it by itself and then went back. Has this happened to anyone else and can you tell me what's going on? Is this normal?
Earthquakes or cats!;)

- Nick
 

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