Configure macOS power management settings, as one might do in System Preferences > Energy Saver. Commands that modify settings must begin with sudo.
# To display the current power management settings:
pmset -g
# To display the current power source and battery levels:
pmset -g batt
# To put display to sleep immediately:
pmset displaysleepnow
# To set display to never sleep when on charger power:
sudo pmset -c displaysleep 0
# To set display to sleep after 15 minutes when on battery power:
sudo pmset -b displaysleep 15
# To schedule computer to automatically wake up every weekday at 9 AM:
sudo pmset repeat wake MTWRF 09:00:00
# To restore to system defaults:
sudo pmset -a displaysleep 10 disksleep 10 sleep 30 womp 1