IMac screen will not come on after sleep

iMac screen does not come on after sleeping for a period of time - twice now from overnight. The back seems to be warm. I have to hold the on button until I hear the drive and system shut down.  Then after period of time it will start just fine.  ?????

I know that some of the older imacs had overheating problems that caused unexpected sleep.  try to keep the display darker and keep the room not too hot.  That seems to usually solve the issue.

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