how to suspend/wake-up a FreeBSD machine?

[Mikhail T.]

Hello!

I managed to suspend some of my computers a few times (using
either ``zzz'' or ``acpiconf -s 1''), but I could never successfully
wake the system up after this, requiring a full reboot.

What's the proper procedure? I tried the power-button (no effect) and
hitting random keyboard keys (no effect). How is it supposed to work?

Thanks!

	-mi