Sleep problems

Nov 8, 2018
Gigabyte Z97X-UD5H-BK
Intel 4790K
Intel HD Graphics 4600
Hi all. Just followed guide to install Mojave. Upgraded to 10.14.1. Everything works great apart from sleep. When I ask the computer to sleep, the monitor goes to sleep but the computer continues to run. If I leave the computer for a while, it will go to sleep eventually. Either way, once the monitor goes to sleep, it will not wake up when the computer does. The only way to get picture back on the monitor is by restarting machine. Haswell processor (4790K) on Gigabyte Z97X-UD5H-BK.

Everything worked great on High Sierra. Any assistance would be greatly appreciated.