1、查看是否开启休眠模式

systemctl status sleep.target

发现如下所示：

● sleep.target - Sleep
     Loaded: loaded (/lib/systemd/system/sleep.target; static; vendor preset: enabled)
     Active: inactive (dead)
       Docs: man:systemd.special(7)

2、执行关闭休眠功能的命令，如下：

sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

可以看到系统返回：

Created symlink /etc/systemd/system/sleep.target → /dev/null.
Created symlink /etc/systemd/system/suspend.target → /dev/null.
Created symlink /etc/systemd/system/hibernate.target → /dev/null.
Created symlink /etc/systemd/system/hybrid-sleep.target → /dev/null.

3、观察系统休眠状态，如下：

systemctl status sleep.target

可以看到自动休眠模式已被关闭：

● sleep.target
     Loaded: masked (Reason: Unit sleep.target is masked.)
     Active: inactive (dead)