Mako_Elite, the zzz command is a variant of the apm(8) command. Their shared man page says:
Code:
DESCRIPTION
apm communicates with the Advanced Power Management daemon, apmd(8),
making requests of it for current power status or to place the system
into a suspend or stand-by state.
So as
Shep recommends, be sure the apmd program is started. You can start it manually, as well as with rc.d(8).
FYI - the apmd program communicates with ACPI or APM hardware via drivers. Your computer has ACPI. If the computer has both, the kernel makes a heuristic decision which to use at boot time.