Mac Pro on High Sierra doesn't wake up?

My Mac Pro (late 2013, cylinder), doesn't want to wake from sleep. I have not a clue what is going on (worked all fine with Sierra).

Anybody?

Config:

• MacPro 2013 (MacPro6,1) + 2x EIZO EV2450 (both via display-port)
• Energy Settings: everything unchecked
• Turn display of after 5 minutes

What I noticed:

• Screens are in standby/sleep
• I can hear the fan (still spinning)
• Power button (on the back) is pulsating (yet fan is not silent?)

What I did:

• Press power-button for 5 seconds
• Start and try to zap PRAM
• Shutdown
• Pulled power cable for 15 seconds
• Plug cable (wait 5 seconds)
• Start Mac.

update:

check your power-management settings:

// terminal
pmset -g live

My settings are (and seem to work for now):

 standby              1
 Sleep On Power Button 1
 womp                 0
 autorestart          0
 hibernatefile        /var/vm/sleepimage
 powernap             0
 gpuswitch            2
 networkoversleep     0
 disksleep            10
 sleep                5 (sleep prevented by sharingd)
 autopoweroffdelay    28800
 hibernatemode        0
 autopoweroff         1
 ttyskeepawake        1
 displaysleep         5
 standbydelay         10800

update 2:

For those running into these issues. Two more things you could try.

• connect your keyboard (if you use usb wired) direct to your mac. Not via a hub or monitor
• connect each monitor with a usb cable to your mac (this could trigger the wake event)

Solution 1:

sudo pmset -a hibernatemode 0 

fixed the problem in my case.