How to know why my iMac wakes itself since the installation of Sierra?

I installed macOS Sierra yesterday. Since then, whenever I put my iMac to sleep he awakened by himself some time later and stayed awake until manually put still asleep. I don't know how long it took before he woke up every time. I looked for a revival in the Console, but this utility has changed a lot and I found no reasons wakeup which appeared in the previous version. Nothing else has changed since El Capitan other than the update for Sierra.

I'm looking for clues to help find the cause of this new problem.

Maybe some useful tips here... If your Mac does not sleep or wake up when expected - Apple Support

Tags: Mac OS & System Software

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    22% kernel_task

    19% Google Chrome Helper (9)

    5% WindowServer

    4% mdworker (9)

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    506 MB kernel_task

    176 MB Google Chrome

    127MO Finder

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