Code around sleep was written into the service manager's sleep units by the module that needed it,
and the mesh could not tell a sleeping machine from a lost one. power runs every module's code for
the six moments, each piece bounded, owns logind's power handling from its settings, and says
booted, sleeping, woke, shutting-down and the power source on the bus, sleeping under logind's
delay lock before the machine sleeps.
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