Open System Settings
Click Lock Screen
Set “Turn display off on battery when inactive” to a longer time or Never
Set “Turn display off on power adapter when inactive” to a longer time or Never
Open System Settings
Click Battery
Turn off “Put hard disks to sleep when possible” if available
Open System Settings
Click Displays
Adjust display sleep settings if available
Open System Settings
Click Energy Saver, if available
Disable sleep-related options
Keep the Mac plugged into power
Use Terminal and run `caffeinate`
Use Activity Monitor to check for apps preventing sleep
Close apps or processes that may trigger sleep
Keep the lid open on a MacBook
Use an external app designed to prevent sleep