2013 Mac Pro keeps crashing, but only during night

I'd try running in safe mode. See if problem persists. Try a safe boot. Shutdown your machine. Hold down the shift key. Poweron. The boot up will take longer than normal because the filesystem on the startup drive is being checked and repaired as needed. All about safe mode including what features and apps safe boot leaves out. Safe boot uses a software driver instead of using your machines video hardware.

http://support.apple.com/kb/ht1455

I'm suspicious about com.paceap.kext.pacesupport.snowleopard 5.9.1 for two reason. I assume you are running a more recent version of macOS. Secondly, it seems to be part of some anti-virus app. Fyi: Anti-virus apps are a frequent cause of macOS problems. How to uninstall:

https://discussions.apple.com/thread/1640428

Run etrecheck and post results back here.

https://itunes.apple.com/us/app/etrecheck/id1423715984?mt=12