Why my Mac under 10.12 only sleeps for 2 seconds?

I installed Mac OS Sierra tonight.  Whenever I put it to sleep under the Apple Menu, he sleeps for a second or two and then the screen wakes up again.  My system has never done that before Sierra.  How should I do?

Please read If your Mac does not sleep or wake up when expected - Apple Support. The applicable section is likely to be "If your Mac wakes up suddenly.»

Tags: Mac OS & System Software

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