[CentOS] systemd-sleep

I found that one of my users' workstation is, for some reason, running
systemd-sleep. I cannot find, anywhere on the system. system-sleep.conf
(or systemd-sleep.conf), nor do I find systemctl status system[d]-sleep.

How can I turn this thing off, other than renaming
/usr/lib/systemd/systemd-sleep?

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