We find that if people manually sleep a mac running Mojave (10.14.5) from the Finder menu that mac is then nearly impossible to wake up. So, at least on lecterns, I am using this command to disable the sleep menu item –
defaults write /Library/Preferences/com.apple.PowerManagement.plist SystemPowerSettings -dict SleepDisabled -bool YES

For more details see:
https://derflounder.wordpress.com/2013/01/27/disabling-the-sleep-command-in-the-apple-menu/