I have a terrible work / non-work balance, and one trivial habit I've established is turning off my (Mac mini & MacBook Air) computers & screens when my work time is done.
I don't want it to be trivially easy for me to just do one more thing…there be dragons.
My Saturday mornings are more often markers for running Onyx[1] for maintenance.
I know you didn't ask, but check your Time Machine snapshots in Disk Utility. If you prefer a CLI approach, this should work: