Comment by Nezteb

From `man pmset`:

    SAFE SLEEP ARGUMENTS
        hibernatemode supports values of 0, 3, or 25. Whether or not a hibernation image gets
        written is also dependent on the values of standby and autopoweroff
    
        For example, on desktops that support standby a hibernation image will be written after the
        specified standbydelay time. To disable hibernation images completely, ensure hibernatemode
        standby and autopoweroff are all set to 0.
    
        hibernatemode = 0 by default on desktops. The system will not back memory up to persistent
        storage. The system must wake from the contents of memory; the system will lose context on
        power loss. This is, historically, plain old sleep.
    
        hibernatemode = 3 by default on portables. The system will store a copy of memory to
        persistent storage (the disk), and will power memory during sleep. The system will wake from
        memory, unless a power loss forces it to restore from hibernate image.
    
        hibernatemode = 25 is only settable via pmset. The system will store a copy of memory to
        persistent storage (the disk), and will remove power to memory. The system will restore from
        disk image. If you want "hibernation" - slower sleeps, slower wakes, and better battery
        life, you should use this setting.
    
        Please note that hibernatefile may only point to a file located on the root volume.