So, the problem may be in Windows. Please read Won’t Wake Up from Sleep on Windows 10: How to fix it?
If you google "windows 10 won't wake up from sleep", you will find more advices.
Checked your link, didn't help. Was finally able to downgrade the BIOS using the Recovery method, didn't help. Will do some more google searches on the topic. When I press the power button during sleep the blue light on the NUC turns on but no other signs of life happen.
Again final workaround. Set BIOS and power settings to default. Reset advanced power settings to sleep never, hybernate 30 minutes. Works good. I made a mistake before putting it to sleep and testing rather than Hybernate. Also unchecked sleep and checked hybernate in show in power settings. Finally a process that works. To bad for not being able to use sleep.