how to put macOS in Hibernate (Deep Sleep) mode – and how to disable it again

• http://www.karthikk.net/2011/12/put-mac-os-x-lion-in-hibernate-deep-sleep-mode-how-to/
• https://www.lifewire.com/change-mac-sleep-settings-2260804
• man pmset [link]

$ sudo pmset -a hibernatemode 25
$ sudo pmset -a hibernatemode 3
$ sudo pmset -a hibernatemode 0