Why does iMac keep waking up by itself?

Question

macOS

Why does iMac keep waking up by itself?
The option "Wake from sleep to access the network" is activated. Mac wakes up every minute or so. How to find out why? Disable the option do not offer, I always need remote access to the poppy. Maybe there are some logs that you can look at and say, yeah, this process constantly brings the poppy out of sleep.
When you disable the option "Wake from sleep to access the network". everything is fine, the poppy falls asleep and does not wake up spontaneously, but I cannot disable this option as I sometimes need remote access and WOL (Wake on LAN) work.

Answer 1

This mode is also used for other purposes, such as periodically checking mail. Look at the settings of the mail client and all kinds of weather, promotions, etc.

Answer 2

What do the logs show in the console?