Monitor sometimes does not go to sleep on a Mac

"I have found similar problems from time to time: it may be a particular process or application which prevents the idle timer from kicking in.

Try quitting programs like VLC, Quicktime Player and the like.

A good test might be to restart the machine, and then see if it will allow the monitor to go to sleep. Then use ps or Activity Monitor to see which processes are running."

"I've recently found what might be a reason for lots of will-not-stay-asleep issues with OSX.

Apparently, it is to do with Airport (WiFi) being connected:

It almost seems like the AirPort is
failing to disengage itself when going
into sleep mode. Then when it goes
into sleep, the Airport awakens the
computer to reestablish the network
connection.

(from a discussion here)

And, there is a potential solution. Using Wireless Sleeper can fix the problem under certain circumstances.

I've only just started using it, but hopefully it will solve my issues like this that seem to have re-emerged lately."

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