I wouldn't be surprised if most people didn't notice that their MacBook was hibernating. Apple tries to hide it by showing you the login screen immediately, but that period where you can't interact is the device resuming from hibernation. It's a similar trick to what they do on iOS. When you open up an application that was suspended, it shows an image while reloading the saved state to make it seem like the app never closed. (As documented here: https://developer.apple.com/documentation/uikit/uiapplicatio... )